Synonyms for sullen Found 11 synonyms across 2 meanings for “sullen”. showing a brooding ill humor (adj) darkdourgloweringglummoodymorosesaturninesour darkened by clouds (adj) heavyloweringthreatening Explore Related Words Rhymes with sullenSynonyms for darkSynonyms for dourSynonyms for gloweringSynonyms for glumSynonyms for moody Synonym Finder | Rhyme Finder | Poetry Editor