dour vs glowering

dour and glowering both are adjectives.

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

As adjectives, dour and glowering are synonyms defined as:

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

dour (adjective)	glowering (adjective)
showing a brooding ill humor	showing a brooding ill humor
stubbornly unyielding
harshly uninviting or formidable in manner or appearance