1610s, "unrefined, rough," from Latin impolitus "unpolished, rough, unrefined," from assimilated form of in- "not, opposite of" (see in- (1)) + politus "polished" (see polite). Sense of "discourteous, ill-mannered" is from 1739. Related: Impolitely; impoliteness.
例文
1. I was impolite and I do beg your pardon.
失礼しました。申し訳ありません。
2.It is impolite to ask too many questions.
あまりにも多くの質問をするのは失礼です。
3.Don 't stare at me-it 's impolite ！
じっと見ないで――これは失礼だ！
4.Some people think it is impolite to ask someone 's age.
人の年齢を聞くのは失礼だと考える人もいる。
5.It isn 't easy to put up with people who are impolite .