underbred vs rude

underbred and rude both are adjectives.

Word	Noun	Adjective	Verb	Adverb
underbred	No	Yes	No	No
rude	No	Yes	No	No

As adjectives, underbred and rude are synonyms defined as:

Other synonyms of underbred include bounderish, ill-bred, lowbred, yokelish.

underbred (adjective)	rude (adjective)
of inferior or mixed breed	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