mid-15c., "not true," from French impropre (14c.), from Latin improprius, from assimilated form of in- "not, opposite of" (see in- (1)) + proprius (see proper). Meaning "not suited, unfit" is from 1560s; that of "not in accordance with good manners, modesty, decency" is from 1739. Related: Improperly (late 14c.).
例文
1. He would never be improper ,he is always the perfect gentleman.
彼はいつもきちんとした振る舞いをしていて、ずっと完璧な紳士です。
2.Mr Matthews maintained that he had done nothing improper .
マシューズ氏は違法なことをしたことがないと主張した。
3.It 's considered improper to be unclothed in public.
公共の場で裸になるのはみっともないとされている。/
4.The committee concluded that the senators had engaged in improper conduct.
委員会は議員たちが不正な活動をしていると断定した。
5.He was very indignant with his wife over her improper conduct.