Source : Webster's Revised Unabridged Dictionary (1913)

Baseborn \Base"born`\, a.
   1. Born out of wedlock. --Gay.

   2. Born of low parentage.

   3. Vile; mean. ``Thy baseborn heart.'' --Shak.

Source : WordNet®

baseborn
     adj 1: of low birth or station (`base' is archaic in this sense);
            "baseborn wretches with dirty faces"; "of humble (or
            lowly) birth" [syn: {base}, {humble}, {lowly}]
     2: illegitimate [syn: {base}]