[bù zhèng dāng]
improper; illegitimate; dishonest; devious
improper reason
不正当的理由
dishonest methods; devious means
不正当的手段
unlawful profits
不正当的收益
illegitimate occupation
不正当的职业
illegitimate sex relation
不正当男女关系
illegitimate income
不正当收入
Judges cannot permit irregularity in carrying out justice.
法官执法时不允许有不正当的行为。