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Definition of glum : 1. Moody; silent; sullen.
2. showing a brooding ill humor; " a dark scowl"; " the proverbially dour New England Puritan"; " a glum, hopeless shrug"; " he sat in moody silence"; " a morose and unsociable manner"; " a saturnine, almost misanthropic young genius"- Bruce Bliven; " a sour temper"; " a sullen crowd"
3. Sullenness.
4. To look sullen; to be of a sour countenance; to be glum.

Synonyms:

heavy, drear, dire, lonesome, darkening, dark-skinned, saturnine, lonely, unyielding, tenacious, down in the mouth, drab, down, dingy, murky, pouting, persistent, black, Cimmerian, light, heavyhearted, benighted, obscure, chill, morbid, unhappy, off, funereal, depressive, depressing, ill-natured, cloudy, woebegone, threatening, non-white, melancholic, heartsore, hangdog, elegiac, desolate, doleful, downcast, wretched, low-spirited, sepulchral, saddened, pouty, off-key, forbidding, somber, godforsaken, sorrowful, sorry, tenebrous, gray, plutonian, crestfallen, subdued, brokenhearted, lowering, temperamental, cold, dogged, false, comfortless, happy, solemn, droopy, sinister, inconsolable, cast down, low, homesick, tenebrific, dreich, sunless, turned, lugubrious, rancid, bad, mopey, heartsick, coloured, pertinacious

contemplative, discouraged, disconsolate, heartbroken, dejected, anxious, downhearted, woeful, joyless, gloomy, melancholy, sullen, despondent, dreary, depressed, disheartened, overcome, grim, mournful, despairing, moody, anguished, lachrymose, morose, plaintive, wistful, sad, blue, miserable, pensive, dispirited, dolorous

contrary, dour, dissociable, long-faced, crabby, broody, grouchy, unsociable, malevolent, hostile, moping, unfriendly, dark, grumpy, cross, fretful, sour, irascible, scowling, cynical, obstinate, beetle-browed, mean, petulant, surly, ungenial, uncooperative, cantankerous, noncooperative, sulky, frowning, glowering

hopeless, dismal, pessimistic, spiritless, desperate, forlorn, cheerless, bleak

Usage examples:

• This seemed an agreeable arrangement for every one but Britton, who looked so glum that I, glad of the excuse, offered to help him. - "A Fool and His Money", George Barr McCutcheon.
• But Nell laughed and jested, flinging back at me now and again a look that mocked my glum face and declared her keen pleasure in my perplexity and her scorn of Barbara's shame. - "Simon Dale", Anthony Hope.
• You look as glum as a Jesuit in Lent. - "Helmet of Navarre", Bertha Runkle.