ill-natured

from WordNet (r) 3.0 (2006)

ill-natured
    adj 1: having an irritable and unpleasant disposition [ant:
           {good-natured}]

from The Collaborative International Dictionary of English v.0.48

Ill-natured \Ill`-na"tured\, a.
   1. Of habitual bad temper; having an unpleasant disposition;
      surly; disagreeable; cross; peevish; fractious; crabbed;
      -- of people; as, an ill-natured person; an ill-natured
      disagreeable old man. Opposite of {good-natured}.

from Moby Thesaurus II by Grady Ward, 1.0

21 Moby Thesaurus words for "ill-natured":
      bad-tempered, bitter, crabbed, cranky, cross, crusty, dour,
      evil-disposed, evil-tempered, gloomy, ill-affected,
      ill-conditioned, ill-disposed, ill-humored, ill-intentioned,
      ill-tempered, malevolent, morose, petulant, sour, sulky

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