lowbred vs underbred

lowbred and underbred both are adjectives.

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

As adjectives, lowbred and underbred are synonyms defined as:

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

lowbred (adjective)	underbred (adjective)
(of persons) lacking in refinement or grace	of inferior or mixed breed
	(of persons) lacking in refinement or grace