Underbred

The art of governing these under-bred varlets lies more in the dignity of looks than in words […].

Himself, he felt the most underbred of all; he was afraid of these Utopians: snobbish and abject before them, he was like a mannerless earthy lout in a drawing-room, and he was bitterly ashamed of his own abjection.

I prefer both sire and dam to be well-bred, but a well-bred mare and an underbred horse will produce a faster animal than a thoroughbred horse and an underbred mare.