The Collaborative International Dictionary of English v.0.48:

Ill-tempered \Ill`-tem"pered\, a.
   1. Of bad temper; grouchy; morose; crabbed; sour; peevish;
      fretful; quarrelsome.

   Syn: crabbed, crabby, cross, fussy, fussbudgety, grouchy,
        grumpy, bad-tempered.
        [1913 Webster]

   2. Unhealthy; ill-conditioned. [Obs.]
      [1913 Webster]

            So ill-tempered I am grown, that I am afraid I shall
            catch cold, while all the world is afraid to melt
            away.                                 --Pepys.
      [1913 Webster]

WordNet (r) 3.0 (2006):

ill-tempered
    adj 1: annoyed and irritable [syn: crabbed, crabby, cross,
           fussy, grouchy, grumpy, bad-tempered, ill-
           tempered]

Moby Thesaurus II by Grady Ward, 1.0:

19 Moby Thesaurus words for "ill-tempered":
   bad-tempered, crabbed, dyspeptic, fractious, hot-tempered, huffy,
   ill-humored, ill-natured, irritable, peevish, petulant, querulous,
   rusty, shrewish, snappish, sour, surly, vixenish, waspish