“没礼貌”是说一个人不懂礼貌，说话或做事对别人不客气、不尊重。

"没礼貌" means a person is impolite, speaking or acting without courtesy or respect to others.

我们常用它来批评别人的行为，比如不打招呼或者大声说话。

We often use it to criticize others' behavior, like not greeting or speaking loudly.