glumly, adv.glumness, n.
/glum/, adj., glummer, glummest.
sullenly or silently gloomy; dejected.
[1425-75; late ME; var. of GLOOM]
Syn. 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.

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Universalium. 2010.