Meaning of “rude” - Learner’s Dictionary

rude

adjective us uk /ruːd/
He was extremely rude to me in the meeting.The taxi driver was rude and unhelpful.She asked him to excuse her for being so rude.It would be rude to leave without saying goodbye.He's so rude, I don't know how you put up with him.
OFFENSIVE

B1 behaving in a way that is not polite and upsets people:

a rude remark
He complained that a member of staff had been rude to him.
[ + to do sth ] It would be rude to leave without saying goodbye.
SEXUAL/TOILET

Rude words or jokes relate to sex or going to the toilet.

rudely adverb
rudeness noun [ U ]

See also

(Definition of “rude” from the Cambridge Learner’s Dictionary © Cambridge University Press)