不客气的英语可以用 "rude" 或 "impopte" 来表示。
"Rude" 是中世纪拉丁语 "rudus" 的变体，意思是 "粗鲁的" 或 "无礼的"。
"Impopte" 是由 "im-" (否定前缀) 和 "popte" (礼貌的) 拼接而成，意思是 "不礼貌的"。
例句：
It was rude of him to interrupt her while she was speaking. (他在她说话时打断她是很无礼的。)
He was impopte to the waiter and didn't say please or thank you. (他对服务员很不礼貌，没有说请或谢谢。)