improper
adjective /ɪmˈprɒpə(r)/
  /ɪmˈprɑːpər/
(formal)- dishonest, or morally wrong不诚实的;不正当的;不道德的 - He had been indulging in improper business practices.他一直参与不正当的商业活动。 
- She was suspended for improper conduct.她因行为不当而被停职。 
- There was nothing improper about our relationship (= it did not involve sex).我们的关系没有什么不正当的。 
- places where it is considered improper for men and women to kiss in public认为男女不宜当众亲吻的地点 
 Collocations Dictionaryverbs- be
- seem
- consider something
- …
 - highly
- most
- quite
- …
 
- He had been indulging in improper business practices.
- not right or appropriate for the situation不合适的;不适当的;不得体的 - It would be improper to comment at this stage.在这个阶段发表评论并不恰当。 
 Collocations Dictionaryverbs- be
- seem
- consider something
- …
 - highly
- most
- quite
- …
 
- It would be improper to comment at this stage.
- wrong; not correct错误的;不正确的 - improper use of the drug药物的误用 
 
- improper use of the drug
词源late Middle English: from French impropre or Latin improprius, from in- ‘not’ + proprius ‘one's own, proper’.