These are all words for people showing a lack of respect for other people. 以上各词均指人粗鲁、无礼。

• rude having or showing a lack of respect for other people and their feelings 指粗鲁的、无礼的、粗野的：◆Why are you so rude to your mother? 你为什么对你的母亲这么没礼貌？◆It's rude to speak when you're eating. 吃东西时说话不礼貌。
• cheeky (BrE, informal) (especially of children) rude in an amusing or an annoying way （尤指小孩子）厚脸皮的、鲁莽的、放肆的：◆You cheeky monkey! 你这厚脸皮的猴崽子！◆a cheeky grin 厚颜无耻的龇牙一笑
• insolent (rather formal) very rude, especially to sb who is older or more important （尤指对长者、重要人士）粗野的、无礼的、侮慢的 NOTE Insolent is used especially to talk about the behaviour of children towards adults. * insolent 尤用于形容孩子对成年人的行为。
• disrespectful (rather formal) showing a lack of respect for sb/sth 指不尊敬、无礼、轻蔑：◆Some people said he had been disrespectful to the President in his last speech. 有些人说他在最近一次讲话中对总统不尊重。
• impolite (rather formal) not behaving in a pleasant way that follows the rules of society 指不礼貌、粗鲁：◆Some people think it is impolite to ask someone's age. 有些人认为询问别人的年龄是不礼貌的。 NOTE Impolite is often used in the phrases It seemed impolite and It would be impolite. * impolite 常用于 it seemed impolite 和 it would be impolite 短语中。
• impertinent (rather formal) not showing respect for sb who is older or more important 指（对长者或重要人士）粗鲁无礼、不尊敬 NOTE Impertinent is often used by people such as parents and teachers when they are telling children that they are angry with them for being rude. * impertinent 常用于父母、老师等对孩子的粗鲁行为表示气愤：◆Don't be impertinent! 不要粗鲁无礼！
• discourteous (formal) having bad manners and not showing respect 指不礼貌、失礼、粗鲁：◆He didn't wish to appear discourteous. 他不想显得没礼貌。

Patterns

• rude/cheeky/disrespectful/impolite/discourteous to sb
• rude/impolite/impertinent to do sth