Webster's Revised Unabridged Dictionary · 1913

Glum

Glum (glum) , noun

[See Gloom.]

Sullenness. [Obsolete] — Skelton

Glum , adjective

Moody; silent; sullen.
I frighten people by my glun face. — Thackeray

Glum , intransitive verb

To look sullen; to be of a sour countenance; to be glum. [Obsolete] — Hawes