glum /ɡlʌm/adjective 1noun 1verb 1forms 5 adjective1 •Despondent; moody; sullen.I[…]frighten people by my glum face. — 1857 noun1 •(no longer used) sullenness verb1 •(no longer used) To look sullen; to be of a sour countenance; to be glum.upon me he gan to loure and glum, Enforcing him so for to ryse withall, But that I shortly unto hem did cum, With his thre hedes he spytte all his venum — 1509 formsglummed · glumming · glums · glummer · glummest