Etymology
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underbred (adj.)

"of inferior breeding, vulgar," 1640s, from under + past participle of breed (v.). Of animals, "not pure bred," attested from 1890.

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Definitions of underbred

underbred (adj.)
(of persons) lacking in refinement or grace;
Synonyms: ill-bred / bounderish / lowbred / rude / yokelish
underbred (adj.)
of inferior or mixed breed;
an underbred dog
From wordnet.princeton.edu