saturnine vs sullen

saturnine and sullen both are adjectives.

Word	Noun	Adjective	Verb	Adverb
saturnine	No	Yes	No	No
sullen	No	Yes	No	No

As adjectives, saturnine and sullen are synonyms defined as:

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

saturnine (adjective)	sullen (adjective)
showing a brooding ill humor	darkened by clouds
bitter or scornful	showing a brooding ill humor