antagonistic, fierce, hostile, hot-tempered

acidic, bearish, bilious, bristly, choleric, crabby, cranky, cross, disagreeable, dyspeptic, fractious, fretful, grouchy, grumpy, huffy, ill-humored, ill-natured, ill-tempered, irascible, irritable, ornery, peevish, pettish, petulant, prickly, querulous, rude, snappish, snappy, stroppy [British], surly, testy, touchy, ugly, waspish

savage, vicious

battling, fighting, warring