Lacking in refinement or civility; bad-mannered; discourteous. / Lacking refinement or skill; untaught; ignorant; raw. / Violent; abrupt; turbulent. / Somewhat obscene, pornographic, offensive.

in a rude manner

(rare) Exhibiting, expressing, or full of rudeness; rude

The property of being rude. / A rude remark or behaviour.

plural of rudeness

An unexpected discovery of an undesirable fact, especially one shattering high hopes or signifying the end of a comfortable situation.

plural of rude boy

A male juvenile delinquent, originally in Jamaica in the 1960s. / A male enthusiast of ska music.

plural of rude awakening

(transitive) To make rude; make raw, simplified, or more robust; toughen.