Definition of rude adjective from the Oxford Advanced American Dictionary

      

    rude

     adjective
    adjective
    NAmE//rud//
     
    (ruder, rudest)
     
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  1. 1 having or showing a lack of respect for other people and their feelings synonym impolite a rude comment rude (to somebody) (about somebody/something) The man was downright rude to us. Why are you so rude to your mother? She was very rude about my driving. rude (to do something) It's rude to speak when you're eating. How rude of me not to offer you something to drink! There's no need to be rude! I don't wish to be rude, but I have another appointment in five minutes.
  2. 2[only before noun] (formal) sudden, unpleasant, and unexpected Those expecting good news will get a rude shock. If the players think they can win this match easily, they are in for a rude awakening.
  3. 3 (literary) made in a simple, basic way synonym primitive rude shacks
 
noun [uncountable] She was critical to the point of rudeness. I want to apologize for my rudeness the other day.
Thesaurusrudesassy insolent disrespectful impolite impertinent discourteousThese are all words for people showing a lack of respect for other people.rude having or showing a lack of respect for other people and their feelings:Why are you so rude to your mother? It's rude to speak when you're eating.sassy (informal) (especially of children) rude in an amusing or an annoying way:sassy behavior a sassy remarkinsolent (somewhat formal) very rude, especially to someone who is older or more important Insolent is used especially to talk about the behavior of children toward adults.disrespectful (somewhat formal) showing a lack of respect for someone or something:Some people said he had been disrespectful to the President in his last speech.impolite (somewhat formal) not behaving in a pleasant way that follows the rules of society:Some people think it is impolite to ask someone's age. Impolite is often used in the phrases It seemed impolite.. and It would be impolite...impertinent (formal) not showing respect for someone who is older or more importantdiscourteous (formal) having bad manners and not showing respect:He didn't wish to appear discourteous.Patterns rude/sassy/disrespectful/impolite/discourteous to somebody rude/impolite/impertinent to do something
See the Oxford Advanced Learner's Dictionary entry: rude