Same word as quarrelsome:

argumentative, bad-tempered, bellicose, belligerent, brawling, cantankerous, cat-and-dog, choleric, churlish, combative, contentious, crabby, cross, disputatious, dissentious, excitable, fiery, fractious, gladiatorial, hasty, have chip on shoulder, hotheaded, huffy, impassioned, irascible, irritable, litigious, ornery, passionate, peevish, pettish, petulant, pugnacious, querulous, ructious, snappy, tempestuous, thin-skinned, touchy, truculent, turbulent, unruly, violent, war