WordNet (r) 3.0 (2006):

feisty
    adj 1: showing courage; "the champion is faced with a feisty
           challenger" [syn: feisty, plucky, spunky]
    2: quick to take offense [syn: huffy, thin-skinned,
       feisty, touchy]

Moby Thesaurus II by Grady Ward, 1.0:

28 Moby Thesaurus words for "feisty":
   bearish, bitchy, cankered, cantankerous, churlish, crabbed, cranky,
   cross, cross-grained, crusty, cussed, disagreeable, excitable,
   fractious, huffish, huffy, irascible, irritable, mean, ornery,
   perverse, snappish, spiteful, spleeny, splenetic, testy, ugly,
   waspish