正当

timely / just (when needed)

honest / reasonable / fair / sensible

first month of the lunar year

straight / upright / proper / main / principal / to correct / to rectify / exactly / just (at that time) / right (in that place) / (math.) positive

(onom.) dong / ding dong (bell)

to be / to act as / manage / withstand / when / during / ought / should / match equally / equal / same / obstruct / just at (a time or place) / on the spot / right / just at

at or in the very same... / suitable / adequate / fitting / proper / to replace / to regard as / to think / to pawn / (coll.) to fail (a student)

reasonable self-defense / legitimate defense

dead center / the very middle

to be in the prime of life

(political) legitimacy

the right time for sth / the right season (for planting cabbage)

proper reason / reasonable grounds

improper relationship; illicit relationship

dishonest / unfair / improper

unfair competition / illicit competition

improper relation / adulterous relation