Learner's definition of RUDE
[also more rude; most rude]
not having or showing concern or respect for the rights and feelings of other people
He made rude remarks/gestures.
I was shocked by her rude behavior.
I can't believe that he was so rude to me.
It is rude (of/for you) to always keep us waiting for you.
relating to sex or other body functions in a way that offends others
always used before a noun
happening suddenly in usually an unpleasant or shocking way
If you think this job is going to be easy, you're in for a rude shock. [=you will be unpleasantly shocked when you find out that this job is not easy at all]
He's about to have a rude awakening. [=he's about to find out something that will shock him unpleasantly]
made or done in a simple or rough way
in rude health