- 正当防卫 zhèngdàngfángwèi self-defensereasonable self-defense or legitimate defense within a legal context
- 正当性 zhèngdàngxìng legitimacypolitical legitimacy; validity
- 正当时 zhèngdāngshí in seasonbeing at the correct or peak time of year for a specific crop or activity
- 正当中 zhèngdāngzhōng dead centerdead center; the very middle
- 正当年 zhèngdāngnián primein the prime of life
- 不正当 bùzhèngdàng impropernot in accordance with accepted standards of behavior or morality
- 不正当竞争 bùzhèngdàngjìngzhēng unfair competitionCompetitive business practices that are deceptive, fraudulent, or otherwise injurious to other businesses or consumers.
- 正当理由 zhèngdànglǐyóu justificationproper reason or reasonable grounds for an action
- 不正当关系 bùzhèngdàngguānxì illicit affairimproper or illicit relationship