underbred vs lowbred

underbred and lowbred both are adjectives.

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

As adjectives, underbred and lowbred are synonyms defined as:

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

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