The Collaborative International Dictionary of English v.0.48:

Forfeit \For"feit\, v. t. [imp. & p. p. Forfeited; p. pr. &
   vb. n. Forfeiting.] [OE. forfeten. See Forfeit, n.]
   To lose, or lose the right to, by some error, fault, offense,
   or crime; to render one's self by misdeed liable to be
   deprived of; to alienate the right to possess, by some
   neglect or crime; as, to forfeit an estate by treason; to
   forfeit reputation by a breach of promise; -- with to before
   the one acquiring what is forfeited.
   [1913 Webster]

         [They] had forfeited their property by their crimes.
                                                  --Burke.
   [1913 Webster]

         Undone and forfeited to cares forever!   --Shak.
   [1913 Webster]

WordNet (r) 3.0 (2006):

forfeited
    adj 1: surrendered as a penalty [syn: confiscate, forfeit,
           forfeited]

Moby Thesaurus II by Grady Ward, 1.0:

20 Moby Thesaurus words for "forfeited":
   ablated, by the board, consumed, depleted, dissipated, eroded,
   expended, forfeit, gone, irretrievable, long-lost, lost, lost to,
   out the window, shrunken, squandered, used, used up, wasted,
   worn away