The Collaborative International Dictionary of English v.0.48:

cussed \cus"sed\ (c[u^]s"[e^]d), adj.
   stubbornly persistent in wrongdoing; obstinate. [Slang or
   Colloq., U. S.]

   Note: [Narrower terms: unregenerate (vs. regenerate),
         unregenerated]

   Syn: obdurate, obstinate, perverse, unrepentant.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

cussed
    adj 1: stubbornly persistent in wrongdoing [syn: cussed,
           obdurate, obstinate, unrepentant]

Moby Thesaurus II by Grady Ward, 1.0:

48 Moby Thesaurus words for "cussed":
   baleful, bearish, bitchy, blankety-blank, blasted, blessed,
   cankered, cantankerous, churlish, confounded, crabbed, cranky,
   cross, cross-grained, crusty, cursed, disagreeable, doggone,
   excitable, feisty, fractious, harmful, hateful, huffish, huffy,
   infernal, iniquitous, invidious, irascible, irritable, malefic,
   maleficent, malicious, malign, malignant, mean, nasty, noxious,
   ornery, perverse, snappish, spiteful, spleeny, splenetic, testy,
   ugly, waspish, wicked