be impolite

基本解释

It is impolite behavior to smoke in a crowded bus.
在拥挤的公交车上抽烟，是不礼貌的行为。
It is impolite for one to urge other people to drink in the west.
在西方，过分劝酒是不礼貌的。
《新英汉大辞典》
It is impolite for a guest to leave the table during a meal, or before the host/hostess gives the signal at the end.
在用餐过程中，当主人未给出离开的信号提前离开是一种不礼貌的行为。

Only a handful of states have legalized gay marriage, but among upscale people in New York and Washington, opposition to gay marriage is now impolite.
FORBES: The Meghan McCain Effect: Why Republicans Won't Talk About Gay Marriage
In the Western world, too little eye contact is interpreted as being impolite, insincere, or even dishonest.
FORBES: The Impact of Eye Contact
The impolite truth is that Robert Forster was The Go-Between's lesser half.
NPR: Go-Betweens' Robert Forster Goes Solo