His uncivil behavior toward the waiter made everyone in the restaurant uncomfortable.

uncivil 由否定前缀 un-（表示"不、非"）和形容词 civil（文明的、礼貌的）组成。civil 来自拉丁语 civis（公民），指符合公民社会规范的言行。uncivil 字面意思是"不符合文明规范的"，即"粗鲁的、无礼的"。