adjective, glummer, glummest.
sullenly or silently gloomy; dejected.

1425–75; late Middle English; variant of gloom

glumly, adverb
glumness, noun

moody, sulky; despondent, melancholy. Glum, morose, sullen, dour, surly all are adjectives describing a gloomy, unsociable attitude. Glum describes a depressed, spiritless condition or manner, usually temporary rather than habitual: a glum shrug of the shoulders; a glum, hopeless look in his eye. Morose which adds to glum a sense of bitterness, implies a habitual and pervasive gloominess: a sour, morose manner; morose withdrawal from human contact. Sullen usually implies reluctance or refusal to speak accompanied by glowering looks expressing anger or a sense of injury: a sullen manner, silence, look. Dour refers to a stern and forbidding aspect, stony and unresponsive: dour rejection of friendly overtures. Surly implies gruffness of speech and manner, usually accompanied by an air of injury and ill temper: a surly reply. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
glum (ɡlʌm)
adj , glummer, glummest
silent or sullen, as from gloom
[C16: variant of gloom]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1540s, from M.E. gloumen (v.) "become dark" (c.1300), later gloumben "look gloomy or sullen" (late 14c.); see gloom.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
But many economists remain worried that momentum could soon weaken, with the
  economy sliding back into glum times.
He turned to look at the five witnesses and was dismayed to see the glum
  expressions on the faces of the stoic islanders.
Paint and tile helped take our remodel from glum to glam.
What should have been a glorious event turned into a glum one.
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