Glum vs Withdrawn - What's the difference?

As verbs the difference between glum and withdrawn

is that glum is to look sullen; to be of a sour countenance; to be glum while withdrawn is past participle of lang=en.

is that glum is despondent; moody; sullen while withdrawn is introvert.

is sullenness.

From (etyl) glomen, glommen, glomben, . More at (l).

(glumm)

(obsolete) To look sullen; to be of a sour countenance; to be glum.

(Hawes)

(-)

(obsolete) sullenness

(Skelton)

Probably from (etyl) . More at (l).

(glummer)

despondent; moody; sullen

* Thackeray

I frighten people by my glum face.

(en adjective)

introvert.

(head)