GLUMMEST
GLUM
glum
(adjective) moody and melancholic
dark, dour, glowering, glum, moody, morose, saturnine, sour, sullen
(adjective) showing a brooding ill humor; “a dark scowl”; “the proverbially dour New England Puritan”; “a glum, hopeless shrug”; “he sat in moody silence”; “a morose and unsociable manner”; “a saturnine, almost misanthropic young genius”- Bruce Bliven; “a sour temper”; “a sullen crowd”
Source: WordNet® 3.1
Adjective
glummest
superlative form of glum: most glum
Source: Wiktionary
GLUM
Glum, n. Etym: [See Gloom.]
Definition: Sullenness. [Obs.] Skelton.
Glum, a.
Definition: Moody; silent; sullen.
I frighten people by my glun face. Thackeray.
Glum, v. i.
Definition: To look sullen; to be of a sour countenance; to be glum. [Obs.]
Hawes.
Source: Webster’s Unabridged Dictionary 1913 Edition