From Longman Dictionary of Contemporary Englishglumglum /ɡlʌm/ adjective (comparative glummer, superlative glummest)SAD/UNHAPPYif someone is glum, they feel unhappy and do not talk a lotSYN gloomyAnna looked glum.After dinner, Kate lapsed into a glum silence. —glumly adverbShe stared glumly at her plate. —glumness noun [uncountable]Examples from the Corpusglum• On the day of the funeral, the mood in the house was glum.• Indeed, he had seemed quite glum.• When Fabia went to bed that night she felt as glum as she had when she had got up.• The glumsymptomsrange from junk-bond distress to the destruction of wealth caused by falling propertyvalues and the thriftsdebacle.• We turned our faces glum to reaffirm the forced nature of this trip.• Ballmaintains the prerequisiteglumvisage, but he's clearly happy standing behind his bank of electronicequipment.Originglum(1500-1600)glum"to look annoyed or bored"((15-19 centuries)), from gloom