optional; voluntary; arbitrary; arbitrary
degree of difficulty; difficulty level
combination; assortment; matching (in a contest); pairing; combination
chain; series; connection; linkage
to be due to; to be caused by; to depend on; to turn on; to be based on; to come from
five; five years of age; eight o'clock (old time system)
degree; amount; grade; standard; of the order of (following a number); about
land mine; topic that sets someone off; sensitive topic; something that seems fine at first but turns out to be very bad (e.g. product, business); booby trap
to play a role; to serve a function; to play a part
establishment; creation; posing (a problem); options setting; preference settings; configuration
oscillation; vibration; swing (e.g. of a pendulum)
the rest; the others; in addition (to that); besides that; and so forth; and the like
change; variation; variety; diversity; inflection; declension
to miss (doing); to fail (to do); to do without
gravity; gravitation; gravitational pull
in accordance with; according to; as X, then Y (e.g. as we age we gain wisdom, as wine matures it becomes more valuable, etc.)
floor; stage (for the narrator and the shamisen player); dining platform built across a river
teacher's desk; teacher's lectern
pillar; post; support; prop; counter for buddhas, gods, nobles, etc.
to be completed; to be finished; to be ready (e.g. to serve or eat); to be very drunk; to get plastered
terrible; dreadful; amazing (e.g. of strength); great (e.g. of skills); to a great extent; vast (in numbers)
in a subdued voice; in undertones; in a whisper; in a mumble; in a murmur
almost; nearly; for the most part; roughly; approximately; about
to be a match for; to rival; to equal; to compare with; to be equivalent to
futility; waste; uselessness; pointlessness; idleness
collapse; crumbling; breaking down; (radioactive) decay; disintegration
halfway; half measures; unfinished; incomplete; by halves; half-baked
result; consequence; consequently; as a result; as a result of; following
to be mixed; to be blended with; to associate with; to mingle with; to join
complete; whole; perfect; safe
stagnation; deposit; sediment; faltering; hesitation; pause
movement; transfer; migration; mobile; moving; traveling
to feel right; to sit well with one; to be happy about; to suit to a T; to fit well together
everything; anything; nothing
repetition; repeat; replication; recursion; iteration
to be used up; to be run out; to be exhausted; to be consumed; to come to an end
style; way; shape; dress; attire; clothing
everyone; anyone; no one; nobody
general public; the masses
to accomplish; to achieve; to complete; to carry out; to carry through
in one go; in one gulp; in one breath; suddenly; all of a sudden; all at once
worthy of special mention
tree; shrub; wood; timber; wooden clappers (signalling the beginning or end of a performance)
(physical) form; shape; visage; (facial) features; form (as opposed to substance); manner (of action); (resultant) state
to form; to make; to build up (e.g. a fortune); to create; to accomplish; to achieve; to change (into)