1、not polite
Talking like that is not polite.
那样谈话不礼貌.
2、rude（ly）
It's rude to stare at people.
盯着看人不礼貌.
He spoke very rudely.
他讲话很不礼貌.
3、bad manners
It 's bad manners to eat like that.
那样吃东西很不礼貌.