Thesaurus

Synonyms for Irascible include:

aggravated, angered, angry, atrabilious, bad-tempered, bilious, black, bristly, cantankerous, choleric, churlish, crabbed, crabby, cranky, cross, crotchety, crusty, curmudgeonly, currish, dark, disagreeable, dour, dyspeptic, enraged, fractious, furious, fussy, glowering, glum, grouchy, gruff, grumpy, hot under the collar, hot-tempered, hotheaded, huffish, huffy, ill-humored, ill-humoured, ill-natured, ill-tempered, incensed, indignant, infuriated, irascible, irate, ireful, irritable, liverish, livid, mad, maddened, misanthropic, misanthropical, misogynous, moody, morose, nagging, nettlesome, ornery, outraged, peckish, peevish, pettish, petulant, prickly, provoked, quick-tempered, saturnine, scratchy, shirty, short-tempered, shrewish, smoldering, smouldering, snappish, snappy, snorty, sore, sour, splenetic, spoiled, spoilt, sulky, sullen, surly, techy, testy, tetchy, ugly, umbrageous, unpleasant, vinegarish, vinegary, waspish, wrathful, wroth, wrothful

irascible is a ADJ.