The Collaborative International Dictionary of English v.0.48:

Discomfit \Dis*com"fit\, v. t. [imp. & p. p. Discomfited; p.
   pr. & vb. n. Discomfiting.] [OF. desconfit, p. p. of
   desconfire, F. d['e]confire; fr. L. dis- + conficere to make
   ready, prepare, bring about. See Comfit, Fact.]
   1. To scatter in fight; to put to rout; to defeat.
      [1913 Webster]

            And his proud foes discomfit in victorious field.
                                                  --Spenser.
      [1913 Webster]

   2. To break up and frustrate the plans of; to balk? to throw
      into perplexity and dejection; to disconcert.
      [1913 Webster]

            Well, go with me and be not so discomfited. --Shak.

   Syn: To defeat; overthrow; overpower; vanquish; conquer;
        baffle; frustrate; confound; discourage.
        [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

discomfited \discomfited\ discomfitted \discomfitted\adj.
   1. thwarted; -- used especially of feelings of defeat and
      discouragement.

   Syn: baffled, balked, discouraged, frustrated, disconcerted.
        [WordNet 1.5]

   2. same as discombobulated.

   Syn: discombobulated.
        [WordNet 1.5]

The Collaborative International Dictionary of English v.0.48:

discomfited \discomfited\ n. pl.
   people who are defeated.

   Syn: defeated.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

discomfited
    adj 1: disappointingly unsuccessful; "disappointed expectations
           and thwarted ambitions"; "their foiled attempt to capture
           Calais"; "many frustrated poets end as pipe-smoking
           teachers"; "his best efforts were thwarted" [syn:
           defeated, disappointed, discomfited, foiled,
           frustrated, thwarted]
    n 1: people who are defeated; "the Romans had no pity for the
         defeated" [syn: defeated, discomfited]

Moby Thesaurus II by Grady Ward, 1.0:

98 Moby Thesaurus words for "discomfited":
   abashed, afflicted, agitated, all up with, amiss, askew, awry,
   beat, beaten, beset, bested, bothered, cast down, chagrined,
   chapfallen, cockeyed, confounded, confused, convulsed, defeated,
   deranged, disarranged, discomforted, discomposed, disconcerted,
   dislocated, disordered, disorderly, disorganized, disquieted,
   distressed, disturbed, done for, done in, down, embarrassed,
   fallen, fixed, floored, haywire, hors de combat, hung up,
   ill at ease, in disorder, lambasted, lathered, licked, misplaced,
   mortified, on the fritz, on the skids, out of countenance,
   out of gear, out of joint, out of kelter, out of kilter,
   out of order, out of place, out of tune, out of whack, outdone,
   overborne, overcome, overmastered, overmatched, overpowered,
   overridden, overthrown, overturned, overwhelmed, panicked,
   perturbed, put to rout, put-out, put-upon, roily, routed, ruined,
   scattered, settled, shuffled, silenced, skinned, skinned alive,
   stampeded, trimmed, troubled, trounced, turbid, turbulent,
   uncomfortable, undone, uneasy, unsettled, upset, whelmed, whipped,
   worsted