Thesaurus

Synonyms for Glum include:

amort, atrabilious, bad-tempered, bilious, blue, bristly, cantankerous, chapfallen, choleric, chopfallen, churlish, crabbed, crabby, cranky, crestfallen, cross, crotchety, crusty, curmudgeonly, currish, dark, deflated, dejected, depressed, disagreeable, dispirited, distressed, dour, down, down in the mouth, downcast, downhearted, dyspeptic, dysphoric, fractious, fussy, gloomy, glowering, glum, grouchy, gruff, grumpy, hot-tempered, hotheaded, huffish, ill-humored, ill-humoured, ill-natured, ill-tempered, irascible, irritable, liverish, lonely, lonesome, long-faced, low, low-spirited, misanthropic, misanthropical, misogynous, moody, morose, nagging, nettlesome, ornery, peckish, peevish, pettish, petulant, prickly, quick-tempered, saturnine, scratchy, shirty, short-tempered, shrewish, snappish, snappy, snorty, sour, splenetic, spoiled, spoilt, sulky, sullen, surly, techy, testy, tetchy, ugly, unhappy, unpleasant, vinegarish, vinegary, waspish

glum is a ADJ.