Source : Webster's Revised Unabridged Dictionary (1913)

Lowbred \Low"bred`\, a.
   Bred, or like one bred, in a low condition of life;
   characteristic or indicative of such breeding; rude;
   impolite; vulgar; as, a lowbred fellow; a lowbred remark.

Source : WordNet®

lowbred
     adj : (of persons) lacking in refinement or grace [syn: {ill-bred},
            {bounderish}, {rude}, {underbred}, {yokelish}]