The Collaborative International Dictionary of English v.0.48:

Deform \De*form"\, v. t. [imp. & p. p. Deformed; p. pr. & vb.
   n. Deforming.] [L. deformare; de- + formare to form, shape,
   fr. forma: cf. F. d['e]former. See Form.]
   1. To spoil the form of; to mar in form; to misshape; to
      disfigure.
      [1913 Webster]

            Deformed, unfinished, sent before my time
            Into this breathing world.            --Shak.
      [1913 Webster]

   2. To render displeasing; to deprive of comeliness, grace, or
      perfection; to dishonor.
      [1913 Webster]

            Above those passions that this world deform.
                                                  --Thomson.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Deform \De*form"\, a. [L. deformis; de- + forma form: cf. OF.
   deforme, F. difforme. Cf. Difform.]
   Deformed; misshapen; shapeless; horrid. [Obs.]
   [1913 Webster]

         Sight so deform what heart of rock could long
         Dry-eyed behold?                         --Milton.
   [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

89 Moby Thesaurus words for "deform":
   accommodate, adapt, adjust, alter, ameliorate, batter, better,
   blemish, blur, break up, change, check, cicatrize, confuse,
   contort, convert, crack, craze, cripple, damage, deface, denature,
   disfigure, disorder, disproportion, distort, diversify, fit, flaw,
   fog up, impair, improve, injure, jumble, kink, maim, mangle, mar,
   meliorate, mess up, misshape, mitigate, modify, modulate, muddle,
   mutate, mutilate, obfuscate, obscure, overthrow, qualify,
   re-create, realign, rebuild, reconstruct, redesign, refit, reform,
   remake, renew, reshape, restructure, revamp, revive,
   ring the changes, scab, scar, scarify, screw up, shift the scene,
   shuffle the cards, split, spoil, squinch, subvert, torture,
   truncate, turn the scale, turn the tables, turn the tide,
   turn upside down, twist, unform, unshape, vary, warp, wind,
   work a change, worsen