"不礼貌"用英语可以表达为"impopte"或"rude".
"Impopte"是从拉丁文"impoptus"派生而来的, 其中"im-"是否定前缀, 表示"不", "poptus"源自"popte"，即"礼貌"。"Rude"也是源自拉丁文, "rudis"意为"粗陋, 未加工的", 后来引申为"粗鲁, 不礼貌".
下面是一些例句:
It's impopte to interrupt someone when they're speaking. (打断别人说话是不礼貌的)
He was rude to the waitress and left a tiny tip. (他对服务员很不礼貌, 只给了很少的小费)
It's impopte to stare at someone for a long time. (盯着别人看很久是不礼貌的)
She was rude to her classmates and didn't apologize when she reapzed she was wrong. (她对同学很不礼貌, 当她意识到自己错了时也没有道歉)