I. ˈgləm intransitive verb
( glummed ; glummed ; glumming ; glums )
Etymology: Middle English glomen, probably alteration of gloumen — more at gloom
chiefly dialect : to look glum : frown
II. adjective
( usually glummer usually glummest )
1.
a. : broodingly morose : sullenly ill-humored or displeased
looked glum when they heard the news
b. : dismal , dreary , gloomy
with a countenance as glum as an undertaker's — W.M.Thackeray
2. dialect England : overcast , threatening
the weather looks glum today
Synonyms: see sullen