impropriety
/ˌɪmprəˈpraɪətɪ/noun
(pl. -ies)［mass noun］
- a failure to observe standards or show due honesty or modesty; improper behaviour or character不适当, 不正直, 不谦虚; 不当行为, 不当性：
she was scandalized at the impropriety of the question
问题的不当让她大为愤慨
count noun there are no demonstrable legal improprieties.没有可证明的法律不当行为。
词源
early 17th cent. （also in the sense 'inaccuracy， incorrectness'）： from French impropriété or Latin improprietas, from improprius （see IMPROPER）.