serious; important; significant; grave; weighty
side effect; adverse reaction
poisonous; toxic; addictiveness
not funny; not a laughing matter; not a joke
menstruation; period; time of the month
pain; anguish; distress; suffering; hardship
heavy; weighty; heavy (feeling); depressed; slow; sluggish; important (position, responsibility, etc.)
to hurt; to ache; to feel a pain; to be injured; to be spoiled (e.g. food); to be damaged
troublesome; bothersome; tiresome; annoying
to make a mistake; to mess up; to screw up; to fail
if one is unlucky; if one is careless
both (people); the two of them
joining (a group); becoming a member (of); joining the ranks (of)
likely to do; liable to do; (quite) capable of doing; may (well) do; might do; could do
high efficiency; high performance
to use; to make use of; to utilize; to utilise
sending; forwarding; shipping
part; assigning (allotment of) parts; role; duties
study (e.g. material); learning; for studying
amusement; entertainment; recreation; pleasure; pastime; hobby
to work hard at; to devote oneself to; to be diligent in
gradually; by degrees; little by little; step by step
receipts and expenditure (disbursements)
each place; various places
at that time; at that moment; then; on that occasion
video (esp. digital); video clip; animation; animated cartoon; in-betweens (animation)
large screen (TV, film, etc.)
to borrow; to rent; to hire; to make use of (another's help, wisdom, etc.); to obtain; to use (for another purpose)
to worry (about); to fuss (over); to be careful (about); to pay attention (to); to take (good) care of
so; like this; in this way; this much; to this extent
feeling (much) obliged; being (very) grateful; feeling sorry (for troubling someone); feeling ashamed (e.g. of an error); (arch.) shrinking back in fear
to be stingy (with); to skimp (on)
cheap article; poor-quality article
at the critical moment; when the time comes; when it's most important; when necessary; in an emergency; when push comes to shove
important matter; requirement; requisite; necessary condition
alone; by oneself; on one's own
dangerous; unsettled; troubled; disturbed; insecure
what's the matter?; what's wrong?
assortment; product lineup