Glum, n.
Etymology: [See Gloom.]
Sullenness. [Obs.] Skelton.
2 other Webster entries under this spelling
Glum, a.
Moody; silent; sullen. I frighten people by my glun face. Thackeray.
Glum, v. i.
To look sullen; to be of a sour countenance; to be glum. [Obs.] Hawes.
Shades of meaning
Fernald lists glum only as an antonym, under pleasant.
He lists it without comment; the entries above explain its neighbors.
Synonyms
none given