5
lurid(adjective, sorrow, awful, depress, fear)
5
ornery(adjective, upset, mean, sharp, informal)
5
reserved
5
rude(adjective, coarse, hostile, abrupt, gruff)
5
slow(adjective, dull, heavy, sluggish, inactive)
5
solemn(adjective, sad, sorrow, depression, depress)
5
sunless(adjective, sorrow, depress, sadness, emotion)
5
temperamental(adjective, unpleasant, unstable, irritable, disagreeable)
5
threatening(adjective, mean, bad, wrong, evil)
5
tristful(adjective, sad, dark, sorrow, depression)
5
truculent(adjective, nasty, rude, unpleasant, coarse)
5
uncivil(adjective, rude, coarse, grumpy, abrupt)
5
virulent(adjective, severe, nasty, hostile, resentful)
5
whiny(crabby, moody, sulky, peevish)
5
wistful(adjective, sad, dark, sorrow, depression)
4
antagonistic(adjective, mean, bad, wrong, severe)
4
bleak(adjective, dull, severe, low, unhappy)
4
caustic(adjective, mean, severe, sharp, nasty)
4
contrary
4
depressing
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APASmart Define. (2016). sullen thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/sullen/thesaurus/synonyms
ChicagoSmart Define. 2016. "sullen thesaurus" https://smartdefine.org/sullen/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2016, sullen thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/sullen/thesaurus/synonyms>.
MLASmart Define. "sullen thesaurus" 24 March 2016. Web. 24 September 2026. <https://smartdefine.org/sullen/thesaurus/synonyms>