rude vs ill-bred

rude and ill-bred both are adjectives.

Word	Noun	Adjective	Verb	Adverb
rude	No	Yes	No	No
ill-bred	No	Yes	No	No

As adjectives, rude and ill-bred are synonyms defined as:

Other synonyms of rude include bounderish, lowbred, underbred, yokelish.

rude (adjective)	ill-bred (adjective)
lacking civility or good manners	(of persons) lacking in refinement or grace
belonging to an early stage of technical development; characterized by simplicity and (often) crudeness
socially incorrect in behavior
(used especially of commodities) being unprocessed or manufactured using only simple or minimal processes
(of persons) lacking in refinement or grace