The Collaborative International Dictionary of English v.0.48:

Done \Done\,
   p. p. from Do, and formerly the infinitive.

   1. Performed; executed; finished.
      [1913 Webster]

   2. It is done or agreed; let it be a match or bargain; --
      used elliptically.
      [1913 Webster]

   Done brown, a phrase in cookery; applied figuratively to
      one who has been thoroughly deceived, cheated, or fooled.
      [Colloq.]

   Done for, tired out; used up; collapsed; destroyed; dead;
      killed. [Colloq.]

   Done up.
      (a) Wrapped up.
      (b) Worn out; exhausted. [Colloq.]
          [1913 Webster]

WordNet (r) 3.0 (2006):

done for
    adj 1: destroyed or killed; "we are gone geese" [syn: done
           for(p), kaput(p), gone(a)]
    2: doomed to extinction [syn: done for(p), ruined, sunk,
       undone, washed-up]

Moby Thesaurus II by Grady Ward, 1.0:

166 Moby Thesaurus words for "done for":
   SOL, all bets off, all gone, all off, all over, all up,
   all up with, annihilated, asleep, asleep in Jesus, at an end,
   at rest, ausgespielt, bad, bankrupt, beat, beaten, bereft of life,
   bested, blasted, blighted, breathless, broken, called home,
   canceled, carrion, complete, concluded, confounded, croaked, dead,
   dead and gone, death-struck, deceased, decided, defeated, defunct,
   deleted, demised, departed, departed this life, desolated,
   despaired of, destitute of life, destroyed, devastated,
   discomfited, done, done in, done with, down, down the drain,
   down-and-out, dying, ended, exanimate, expired, expiring, expunged,
   extinct, facing death, fallen, fini, finished, fixed, floored,
   food for worms, given up, going, gone, gone glimmering,
   gone to glory, gone to pot, gone west, had it, hopeless,
   hors de combat, in articulo mortis, in extremis, in ruins,
   inanimate, incapable of life, irremediable, kaput, kaputt,
   lambasted, late, late lamented, lathered, launched into eternity,
   licked, lifeless, low, martyred, moribund, near death, no more,
   nonviable, on the skids, outdone, over, overborne, overcome,
   overmastered, overmatched, overpowered, overridden, overthrown,
   overturned, overwhelmed, panicked, passed away, passed on,
   perfected, perished, pushing up daisies, put to rout, ravaged,
   released, reposing, resting easy, routed, ruined, ruinous, sainted,
   scattered, set at rest, settled, shot, silenced, sinking, skinned,
   skinned alive, sleeping, slipping, slipping away,
   smitten with death, spoiled, stampeded, still, stillborn,
   taken away, taken off, terminal, terminated, through, through with,
   trimmed, trounced, undone, upset, vanished, washed up, washed-up,
   wasted, whelmed, whipped, wiped out, with the Lord,
   with the saints, without life, without vital functions, worsted,
   wound up, wrecked, zapped