他对待客人非常没礼貌。
He was very impolite to the guests.
在公共场合大声说话是没礼貌的。
It is impolite to speak loudly in public.
她打断别人说话，这很没礼貌。
She interrupted others, which was impolite.
他在会议上表现得非常没礼貌。
He behaved very impolite during the meeting.
不回别人的问候是没礼貌的行为。
It is impolite not to return someone's greeting.
