Similar word to quicktempered:

bad-humored, bearish, cantankerous, choleric, crabby, cross, crotchety, cussed, disagreeable, got up on wrong side of bed, grouchy, grumpy, hot-tempered, ill-humored, irascible, irritable, like a bear, mean, ornery, out of sorts, perverse, quick-tempered, ratty, snappish, tetchy, ugly, vinegary