The Collaborative International Dictionary of English v.0.48:

Forsworn \For*sworn"\,
   p. p. of Forswear.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Forswear \For*swear"\, v. t. [imp. Forswore; p. p. Forsworn;
   p. pr. & vb. n. Forswearing.] [OE. forsweren, forswerien,
   AS. forswerian; pref. for- + swerian to swear. See For-,
   and Swear, v. i.]
   1. To reject or renounce upon oath; hence, to renounce
      earnestly, determinedly, or with protestations.
      [1913 Webster]

            I . . . do forswear her.              --Shak.
      [1913 Webster]

   2. To deny upon oath.
      [1913 Webster]

            Like innocence, and as serenely bold
            As truth, how loudly he forswears thy gold!
                                                  --Dryden.
      [1913 Webster]

   To forswear one's self, to swear falsely; to perjure one's
      self. "Thou shalt not forswear thyself." --Matt. v. 33.

   Syn: See Perjure.
        [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

57 Moby Thesaurus words for "forsworn":
   abandoned, abjured, artful, calculating, ceded, contemned, crafty,
   deceitful, declined, declined with thanks, denied, despised,
   disapproved, discarded, discounted, disdained, dishonest,
   disingenuous, dismissed, disowned, dispensed with, disposed of,
   equivocal, excepted, excluded, falsehearted, forgone, ignored,
   insincere, lying, mendacious, not considered, perjured,
   prevaricating, rebuffed, recanted, refused, rejected, released,
   relinquished, renounced, repudiated, repulsed, retracted,
   sacrificed, scheming, scouted, spurned, surrendered, truthless,
   uncandid, unfrank, unsincere, untruthful, unveracious, waived,
   yielded