Definition of glum adjective from the Oxford Advanced Learner's Dictionary

 

glum

 adjective
adjective
BrE BrE//ɡlʌm//
 
; NAmE NAmE//ɡlʌm//
 
Unhappiness
 
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sad, quiet and unhappy synonym gloomy The players sat there with glum looks on their faces. The couple looked distinctly glum. See related entries: Unhappiness Word Origin mid 16th cent.: related to dialect glum ‘to frown’, variant of gloom.
See the Oxford Advanced American Dictionary entry: glum