Glum

Part of speech: noun (n.)

Sullenness. [Obs.] Skelton.

Part of speech: verb (v.)

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

Part of speech: adjective (a.)

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