Keyword
empty air
Info
FrequencyTop 100-200
Type
Kyōiku (1st grade) 
?
KankenLevel 10
Heisig1414
Readings
くう
(52%)
そら
(25%)
(8%)
ぞら
(6%)
から
(4%)
(1%)
Composed of
hole
construction
Mnemonic

If you make a hole during construction it will be filled with empty air.

Used in kanji (5 in total)
refrain
body cavity
boorish
type of harp
Used in vocabulary (774 in total)
sky; the air; weather; far-off place; distant place; state of mind; feeling
air; atmosphere; mood; situation; someone with no presence; someone who doesn't stand out at all
space; room; airspace
to open (e.g. doors); to open (e.g. business, etc.); to be empty; to be vacant; to be available; to be open (e.g. neckline, etc.); to have been opened (of one's eyes, mouth, etc.)
sky; air; mid-air
sky; the skies; high-altitude sky; upper air
night sky
empty; vacant; hollow
to fly in the air
to empty; to remove; to move out; to clear out; to be away from (e.g. one's house); to leave (temporarily); to dawn
empty stomach; hunger
emptiness; vacuum; blank
to become empty; to be emptied
daydream; fantasy; fancy; vision
empty space; empty sky
to become less crowded; to thin out; to get empty; to be hungry
blank space (in documents); vacuum; blank; void
cave; hollow; cavity; hollow
sky; air; ether; firmament; the heavens
to read the situation; to sense the mood
emptiness; hollowness; vacancy; inanity; pointlessness; meaninglessness
space-time
to become hungry; to get an empty stomach
empty air; sky; shunyata; emptiness; air force; fruitlessness; meaninglessness
fictitious; imaginary; fanciful; aerial; overhead
inattention; absent-mindedness
empty; void; vain; fruitless; lifeless
striking (at something) and missing; swing and a miss; vain attempt
wide open sky; the blue; heavens; firmament
to fly through the air; to hurtle through the air; to strike at something and miss; to fan the air
to fly in the sky
to have a hole; to be pierced (with a hole)
racing (of an engine); spinning one's wheels; running idle; fruitless effort; going nowhere; going round in circles
off the top of one's head; from thin air; from memory
vacant land; unoccupied ground; empty lot
hollow; mid-air; air; sky
aviation; flying
empty seat; unoccupied seat; vacancy; vacant post
karate; empty handed
vacuum; hollow; empty
high in the sky
space; room; vacancy; opening; free time; time to spare
to empty; to vacate; to evacuate
available room (hotel); vacancy; room to let
air conditioning
to be free; to be available
vacant house; unoccupied house
unusual space; other dimension
outer space; void of space
mishearing; (feigned) deafness; homophonic translation of song lyrics for comic effect
cloudy sky; overcast sky
gliding (through the air)
to cover up the sky (e.g. smoke)
virtually empty; quite empty; inadequately defended; defenseless; defenceless
to be away from home; to be out of the house
wintry sky; cold weather (in winter); wintry weather
to make way for; to make room for; to get out of the way; to pave the way for; to open up opportunity
to leave space (between)
atmosphere (esp. of a place or person); mood; vibe; ambience
putting on a brave face; put-on cheeriness; pretending one is fine; show of courage; bravado; Dutch courage
aircraft carrier
to have time free; to have time to spare
empty nest; empty house; empty home; burglary (of an empty house); burglar (who targets empty houses)
vacant land; unoccupied ground; empty lot
hyperspace; subspace
fabrication; pipe dream
low altitude; low sky
having vague fears; feeling alarmed; feeling gloomy (about the future); feeling apprehension
anti-aircraft; antiaircraft
air battle; dog fight; aerial battle
to cause a loss; to make a hole (in)
staying in the air; remaining airborne
blank column; blank space
evening sky; twilight sky
free time; spare time
armchair theory; impracticable theory
feeling of emptiness in the stomach; sensation of hunger
false; hypocritical
unable to read the situation; unable to pick up on the mood (e.g. of a conversation)
to feel hungry; to get hungry
clear sky; cloudless sky
underground space; subterranean space; subterranea
aerial bombing
low-altitude flying; having consistently poor results (grades, sales, etc.); barely scraping by; being on the verge of failing
look of the sky; weather
virtual space (e.g. in computer graphics)
unprecedented; record-breaking
to become a little hungry; to become a bit peckish
unable to read the situation; unable to pick up on the mood of a conversation
air defense; air defence
being empty-handed; being penniless; having no capital (for starting a business)
racing (an engine); idling (an engine); going in circles (esp. argument, discussion, etc.); spinning one's wheels
air travel; air trip
high altitude
air battle; dogfight
empty bottle
vacant space; aperture; gap; opening
vacant house; unoccupied house
(so marvelous or horrible that it may be) the first and probably the last
air route; air lane; by air; by plane
empty gun; gun loaded with blanks; firing a blank
spatial; space-like
autumn sky; clear blue autumnal sky
to make oneself available (free)
accidental resemblance
summer sky; summery weather; clear, blazing summer weather
empty (e.g. argument); insubstantial; hollow; fruitless
to swing and miss
inattention; absent-mindedness
control of the air; air supremacy
air-raid shelter; bomb shelter
clear autumn sky
deep blue sky; bottomless blue sky
mid-air breakage or disintegration
air transport; air lift; airlift
to become hungry; to get an empty stomach
to become hungry; to get an empty stomach
hanging garden; hanging gardens
empty stomach; hunger
vacant or unoccupied room
vacant post; vacancy; post in name only
imaginary; fantastical; visionary; utopian; quixotic; fanciful
aerodynamics
anti-aircraft fire; flak
body; one's fortune
cavity; hollow; void; hollow (voice, smile, etc.); blank (eyes, look, etc.); vacant (expression, stare, etc.)
beautiful sky
rainy sky; sky as it looks when it is about to rain; threatening sky
abstract or impracticable theory
territorial airspace
dry cough; hacking cough; intentional cough (i.e. to get someone's attention)
levitation; floating on air; airborne (e.g. bacteria); aero-
airline ticket; plane ticket; air ticket
feigned laughter
air pirate; air piracy
Japan Air Self-Defense Force; JASDF
empty bottle
hyperspace; superspace
waste; wastefulness
anti-aircraft gun; antiaircraft artillery
empty conveyance; empty taxi; free taxi; having spaces available (of a parking lot)
air vent (hole)
deep-fried food (esp. chicken)
to die; to expire
mastery of the air
land, sea, and air; army, navy and air force
to grasp at the air
air pressure (of tires)
(staring) piercingly; (looking) hard
feeling of emptiness; sense of void
air pump; bicycle pump
air gun; air rifle
one's present existence; this mortal frame; this world; cast-off cicada shell; cicada
to feign ignorance; to play dumb
completely empty (of a residence, etc.); vacant; body from which the soul has left; corpse; shed skin (of a snake, insect, etc.)
away from home; while travelling
to aerate; to air
anti-aircraft missile
blank period; window period; interregnum
not busy; unengaged; being free; leisure
vacant or unoccupied room
vacuum pack; vacuum packing
karate practitioner
absentminded response
form is emptiness; matter is void; all is vanity
bad (fictitious) bill; empty promise
aerial photography
surface-to-air missile; SAM
imitated cry (of an animal); lie
Air Self-Defense Force; ASDF
airspace incursion; airspace violation
falsehood; lie
airmail; air mail; air service; air transport (of goods)
stroll in the air (e.g. leisurely helicopter, airplane ride)
deutzia; Deutzia crenata
vast; boundless; vague
short selling
phase space; topological space
major air raid; blitz
to feel hungry; to get hungry
dreamer; daydreamer; visionary
snow-laden sky
Minister of Works (Zhou-dynasty China)
bluffing; bluster; bravado
super-dimensional
empty nest; empty house; empty home; burglary (of an empty house); burglar (who targets empty houses)
to grasp at the air
unburdened horse
air pressure; pneumatic pressure
making a fuss; Much Ado about Nothing (Shakespeare)
broad bean (Vicia faba); horse bean; fava bean
making hollow; making meaningless; deindustrialization; deindustrialisation
air chair; wall sit; exercise mimicking sitting in a chair; chain of people sitting on each other's laps
aerial warfare; air war
emptiness is form; illusion of the reality of matter
flight (plane)
flight dynamics; aerodynamics; aeromechanics
unprecedented in history; unheard-of; epoch-making
treating (someone) like they are air; ignoring (someone)
space perception; spatial perception; spatial awareness
to feel hungry; to get hungry
empty residence; empty estate; empty lot
nuclear-powered aircraft carrier
cold, strong, dry wind
strikeout; (several) vain attempts; failing despite giving one's best
blank email (e.g. for signing up to an email list)
blue sky; azure sky
overcast sky in the rainy season
free space (on a disk)
air traffic control; ATC
empty bottle
vacant house; unoccupied house
morning sky
a woman is as fickle as autumn weather
available room (hotel); vacancy; room to let
Akasagarbha (bodhisattva); the Receptacle of Void
lacking cargo; in ballast
spatial awareness; spatial perception
Great Tokyo Air Raid (March 10, 1945)
the way of karate; karate
air defense identification zone; ADIZ
air cannon (toy)
(unusually) dry rainy season
space manipulation (e.g. supernatural ability)
(power of) imagination
aerial show; air show; airshow
to feign ignorance; to play dumb
anti-aircraft fire; shooting at an aircraft (from ground or ship)
unmanned aerial vehicle (UAV); drone
(Self Defense Force's Air Force) captain (defence); lieutenant
air cooling
traveling alone and with little luggage (travelling)
karate chop (pro wrestling move)
to become free; to get time off
low-cost carrier; LCC; low-cost airline
Civil Aeronautics Law; Aviation Law
seeing something that isn't actually there; hallucination; pretending not to see; looking the other way; looking upwards
idle time; down time; window period
Akasagarbha (bodhisattva)
air route; airway; air lane; air corridor
land, sea and air forces
accidental resemblance
empty stomach; hunger
noncommissioned officer of the Japanese Air Self Defense Forces (Defence)
escort carrier; jeep carrier
air flotilla; air fleet; combat aviation unit of the Imperial Japanese Navy
air chair; wall sit; exercise mimicking sitting in a chair; chain of people sitting on each other's laps
dead letter
open-air market; outdoor market
carrier strike group; CSG
heating a vessel without water in it; heating an empty pan, kettle, boiler, bathtub, etc.
burglary (of an empty house); burglar (who targets empty houses); sneak thief; prowler
air-to-surface missile; ASM
false invoice; false billing
sailplane; glider
fox with supernatural powers
position space (quantum mechanics); real space
aeronautical chart
idling (of an engine)
aerial refueling; in-flight refueling
karate gi; karate uniform
to pretend not to know; to feign ignorance; to tell a lie; to lie
Amoghapasa (manifestation of Kannon)
air transportation; air transport; transport by air
air pocket; air hole
blank; empty space; gap
lonely or uninhabited valley
to play dumb; to feign innocence
atmospheric vibration; infrasound (as produced by volcanic activity)
retching; vomiturition
aircraft warning lights; airplane warning lights; obstacle light; obstruction light
with bare hands; with or from nothing
air conditioning unit; AC unit; air conditioner
to come to naught; to come to nought
(staring) piercingly; (looking) hard
idling (of an engine)
crocodile tears
the empty nature of all things
empty; vacant; void
senior master sergeant (JASDF)
abstract or impracticable theory
air sac; bladder; air bag; windbag; type of inflatable air mattress
air tanker; aerial tanker; airborne refuelling craft
(Self Defense Force's Air Force) colonel (defence); lieutenant; major
impractical or useless theory
aeronautical radio; aircraft radio
horizon; point where the sky meets the earth
flattery; lip service
empty name; false reputation
empty residence; empty estate; empty lot
hollow; cavity; hole
burglary (carried out while a house is temporarily vacated)
autumn weather is as fickle as a man's heart
to speak from memory
major general (JASDF)
empty bucket; karaoke
false or crocodile tears; feigned sadness
air cell; air battery
airman first class (JASDF)
to learn by heart (rote); to memorize; to memorise
Amoghasiddhi; Infallible Magic (a dhyani-Buddha)
the kalpa of nothingness (the final aeon of the universe)
retching; vomiturition
aeronautical engineering
vacant land; unoccupied ground; empty lot
empty; vacant; void
fake; fabrication
ultra-high vacuum; UHV; extremely high vacuum; XHV
burglary (of an empty house); burglar (who targets empty houses); sneak thief; prowler
heating a vessel without water in it; heating an empty pan, kettle, boiler, bathtub, etc.
land and air; land and air forces
weather; course of events
science fiction; sci-fi; fantasy fiction
the open sky and the serene sea; as open as the sky and serene as the sea; magnanimous
blank ammunition; blank cartridge
fictitious transaction; bogus transaction
complete emptiness (i.e. as a denial of the inherent existence of all things); nirvana (where this emptiness is realized); (arch.) quiet and lonely
tube amplifier; valve amplifier
to feign ignorance or unconcern
Chinese water spinach (Ipomoea aquatica); ong choy; kang kong; water morning glory; water convolvulus; swamp cabbage
Chinese water spinach (Ipomoea aquatica); ong choy; kang kong; water morning glory; water convolvulus; swamp cabbage
spatial art; space art; plastic arts; formative arts
vacuum vessel; vacuum chamber
barehanded; having no wealth or position to rely on (aside from one's own resourcefulness) (when embarking on something)
flat broke; stone broke; penniless
chunky mochi made with half-polished rice, stuffed with red bean paste
groundless rumor or story (rumour)
airport site; adjacent to airport
quiver (of arrows; cylindrical)
airman third class (JASDF)
vacancy; room for rent or lease
bluffing; bluster; bravado
open time slot; unoccupied time slot
fabricated dream
vast; boundless; wide and empty; vague and hazy
space-time continuum
international airspace; international space
submarine aircraft carrier
air transportation; air transport; transport by air
vacant lot or land
stand-by (on an airplane)
vacancy; room for rent or lease
parking on the street; curbside parking; kerbside parking; unauthorized parking outdoors
high in the sky
air cargo; air freight
(Self Defense Force's Air Force) general (defence); lieutenant; major
fictitious business trip
earth, water, fire, wind and void (the five elements)
air brake; speedbrake; aerobraking; aerobrake
fraud based on demanding payment for false claims or non-existent bills
air pluviation; pluviate
blank (ticket); unsuccessful lottery ticket
perfect vacuum; absolute vacuum
lonely, spouseless bedroom; bedroom of a neglected spouse
the open sky and the serene sea; as open as the sky and serene as the sea; magnanimous
Great Interregnum (gap between Hohenstaufen and Habsburg rule of the Holy Roman Empire, approx. 1254-1273 CE)
blank; empty space; gap
gossip; chatter
respirator; breathing apparatus
to leave a space (between words)
blank (ticket); unsuccessful lottery ticket
feigned sleep; playing possum
visual space; visuospatial
air transportation; air transport
air freight; airborne cargo
burning incense without making its source obvious; pleasant smell coming from an unknown location
matter is void; all is vanity
to advance unobstructed
air tank (scuba)
vacant rooms available
vacuolation; vacuolization
to sing from memory
false or superficial prosperity
utterly lacking (in ability); hopeless; useless; poor
air chair; wall sit; exercise mimicking sitting in a chair; chain of people sitting on each other's laps
empty bottle
feeling ashamed or embarrassed without knowing why
false; hypocritical
atmospheric electricity
vast; boundless; wide and empty; vague and hazy
airman third class (JASDF)
tea served without sweets
empty house; empty shop
fear of having blank days (e.g. freelancer unable to find work); fear of not having anything planned
embossing; inkless stamping
vacant constituency
(arch.) type of loom used in olden times; loom; traditional loom
air dose (esp. radioactivity)
blank (ticket); unsuccessful lottery ticket
Coriaria japonica (species of shrub)
come to nothingness
null string
Japanese butterfly bush (species of buddleia, Buddleja japonica)
burning incense without making its source obvious; pleasant smell coming from an unknown location
Kumuhensho; lowest heaven of Mushikikai; realm of non-form
fabrication; pipe dream
airman second class (JASDF)
stalled session of the Diet (Japanese Parliament)
weather; course of events
flat broke; stone broke; penniless
touching a food with one's chopsticks, then removing them without taking it (a breach of etiquette)
atmospheric oxidation; oxidation upon exposure to the air; air oxidation; smoothering
vacant and unthinking; something that should be there is not
deep-fried food (esp. chicken)
airport (rail) station
vague recollection; faint memory; rote memorization; rote memorisation
impractical desktop theory (proposition); unworkable idea; an idea that isn't worth the paper it's written on
completely empty (of a residence, etc.); vacant; body from which the soul has left; corpse; shed skin (of a snake, insect, etc.)
empty bottle
atmospheric vibration; infrasound (as produced by volcanic activity)
flat or stone broke
technical sergeant (JASDF)
clicking the shutter of a camera without taking a picture (because no film is loaded, or in order to advance the film)
to recite from memory
fictitious transaction; paper transaction
vacant house; unoccupied house
to cover up the sky (e.g. smoke)
absentmindedness; dreaminess; simpleton; fool
fool; blockhead; idiot; dunce
to play dumb; to feign innocence
idling (of an engine)
burglary (of an empty house); burglar (who targets empty houses); sneak thief; prowler
heating a vessel without water in it; heating an empty pan, kettle, boiler, bathtub, etc.
heating a vessel without water in it; heating an empty pan, kettle, boiler, bathtub, etc.
to become empty (hollow); to relax from a tense situation into a vacant or absent minded state
neon damselfish (Pomacentrus coelestis); heavenly damselfish
to make oneself available
burning incense without making its source obvious; pleasant smell coming from an unknown location
vacant rooms available
empty house; empty shop
(arch.) type of loom used in olden times; loom; traditional loom
airman second class (JASDF)
technical sergeant (JASDF)
fictitious transaction; paper transaction
coming untied
to feel hungry; to get hungry
in vain; to no purpose; fruitlessly
blank email (e.g. for signing up to an email list)
fictitious transaction
National Aeronautics and Space Administration; NASA
air defense artillery; air defence artillery
utterly lacking (in ability); hopeless; useless; poor
fictitious stock
sky on New Year's morning
pneumatic machinery
explosion without effect; wasted bullets
empty shell
fishing without bait
steaming (of food)
buying on margin
Kukai (name of a Buddhist priest)
space or area for water-lovers
deserted and lonesome; quiet and alone; innocent and nonattached; All is void
deserted and lonesome; quiet and alone; innocent and nonattached; All is void
depletion layer (of transistor)
momentum space (quantum mechanics)
spatio-temporal information science; time-space information science
arching backward; looking up
arching backward; looking up
(arch.) type of loom used in olden times; loom; traditional loom
information on space availability in a parking lot (car park)
empty (e.g. intermodal containers in the transport industry)
to have a good opportunity only to let it slip from your grasp; (lit.) to come home empty-handed despite having entered treasure mountain
one-way airline ticket; one-way plane ticket
air-fuel ratio; AFR
truth of emptiness (holding that all things are void)
theoretical air fuel ratio
empty string; null string
empty state; nil state
white space delimiter
AATC; Automatic Air Traffic Control
colour space; color space
display space; operating space
Satsuma mock orange; Philadelphus satsumi
unable to read the situation; unable to pick up on the mood of a conversation
military police brigade (air force)
airport-imposed taxes; airport tax
vacuole (esp. in an animal cell)
aerodynamic performance
demanding payment for a non-existent loan
perfectly clear and serene sky
conventional aircraft carrier (i.e. non-nuclear)
changeable weather
crematorium smoke rising in the sky
aviation insurance; aerial insurance
air conditioning unit; AC unit; air conditioner
vacuum cooking; sous vide
air dose rate (esp. radioactivity)
steam bath; empty bath
cavity resonator; microwave resonance cavity; rhumbataron
pneumatic drill; air drill
mixture of air and hydrocarbon gas or vapour
air suspension; air spring
air suspension; air spring
air suspension; air spring
Japanese war tuba; pre-radar acoustic locator used by the Imperial Japanese Army
superficial velocity; superficial flow velocity
airplane mode; aeroplane mode
elevated railway; overhead railway
canoe, etc. in very clear water (illusion of flying); Flying Canoe (Canadian folk-tale)
aerial cableway; ropeway
empty car; unloaded car
dealt hand containing only 1-point cards (scoring combination)
dealt hand containing only 1-point cards (scoring combination)
tenpai with all potential winning tiles visible on table (impossible to win)
tenpai with all potential winning tiles visible on table (impossible to win)
pedestrian zone; pedestrian space
air writing
air writing; spacial calligraphy (artform)
empty place; unoccupied space
master sergeant (JASDF)
master sergeant (JASDF)
warrant officer (JASDF)
specially designated vacant house; vacant house that has been declared dangerous or dilapidated by the local authority and may be subject to higher taxes, fines or demolition
airborne wind power generation; kite power generation
panicled hydrangea (Hydrangea paniculata); peegee hydrangea
Weigela hortensis (species of deciduous shrub in the honeysuckle family)
grannyvine (species of morning glory, Ipomoea tricolor)
twin-flowering abelia (Abelia spathulata)
slender deutzia (Deutzia gracilis)
glossy abelia (Abelia grandiflora)
white-spotted pufferfish (Torquigener albomaculosus)
Examples (200 in total)
He was looking at the sky.
He stood looking at the sky.
Without air and water, nothing could live.