Webster’s Revised Unabridged Dictionary · 1913
Glum
Glum, n. [See Gloom.] Sullenness. [Obs.] Skelton.
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.