'Underbred' definitions:

Definition of 'underbred'

(from WordNet)
adjective
(of persons) lacking in refinement or grace [syn: ill- bred, bounderish, lowbred, rude, underbred, yokelish]
adjective
Of inferior or mixed breed; "an underbred dog"

Definition of 'Underbred'

From: GCIDE
  • Underbred \Un"der*bred`\, a. Not thoroughly bred; ill-bred; as, an underbred fellow. --Goldsmith. [1913 Webster]