Source : Webster's Revised Unabridged Dictionary (1913)

Half-bred \Half"-bred`\, a.
   1. Half-blooded. [Obs.]

   2. Imperfectly acquainted with the rules of good-breeding;
      not well trained. --Atterbury.

Source : WordNet®

half-bred
     adj : (of animals) having only one purebred parent [syn: {half-blooded},
            {half-breed}]