The Collaborative International Dictionary of English v.0.48:

disowned \disowned\ adj.
   having social connections repudiated.

   Syn: repudiated.
        [WordNet 1.5 +PJC]

The Collaborative International Dictionary of English v.0.48:

Disown \Dis*own"\, v. t. [imp. & p. p. Disowned; p. pr. & vb.
   n. Disowning.]
   1. To refuse to own or acknowledge as belonging to one's
      self; to disavow or deny, as connected with one's self
      personally; as, a parent can hardly disown his child; an
      author will sometimes disown his writings.
      [1913 Webster]

   2. To refuse to acknowledge or allow; to deny.
      [1913 Webster]

            Then they, who brother's better claim disown,
            Expel their parents, and usurp the throne. --Dryden.

   Syn: To disavow; disclaim; deny; abnegate; renounce;
        disallow.
        [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

31 Moby Thesaurus words for "disowned":
   abandoned, cast-off, castaway, contemned, declined,
   declined with thanks, denied, derelict, despised, disapproved,
   discarded, discounted, disdained, dismissed, excepted, excluded,
   forsaken, forsworn, ignored, not considered, outcast,
   outside the gates, outside the pale, rebuffed, refused, rejected,
   renounced, repudiated, repulsed, scouted, spurned