glum vs dour

glum and dour both are adjectives.

Word	Noun	Adjective	Verb	Adverb
glum	No	Yes	No	No
dour	No	Yes	No	No

As adjectives, glum and dour are synonyms defined as:

Other synonyms of glum include dark, glowering, moody, morose, saturnine, sour, sullen.

glum (adjective)	dour (adjective)
moody and melancholic	showing a brooding ill humor
showing a brooding ill humor	stubbornly unyielding
	harshly uninviting or formidable in manner or appearance