Meaning of “rude” - Learner’s Dictionary

rude

adjective uk us /ruːd/
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)