I think it is not rude to call teacher by their first names.

我认为用名字称呼老师并不是粗鲁的。

youdao

It is not rude to stay for cocktails and dinner and then make your farewells, as long as you do so in an unhurried manner and don't give the impression that you are in a rush.

举办鸡尾酒聚餐，之后再告别，只要你从容不迫地这样做，别给人一种你很急的样子，这就并不算无礼。

youdao

It is not rude to write email English, but it is important to use it only at the proper time-when you are emailing a friend, or sending a message to a friend on a mobile phone.

写电子邮件英语并非不无礼，但重要的是只能在合适的时间去写- - - - -当你给朋友发邮件或用手机给朋友发短信时。

youdao

Stuffing envelopes, making phone calls to rude strangers and trudging from house to house is not much fun, unless you think it's going to save the family, the environment or the country.

ECONOMIST: The power of sleaze

It is widely thought that he did not take the attorney-general slot because the confirmation hearings would have involved too many rude questions.

ECONOMIST: Vernon Jordan, gliding through