3
blackened
3
cloudy(adjective, sorrow, depress, sadness, emotion)
3
daunting(adjective, person, feelings)
3
demonic
3
depressing(adjective, hard, severe, obscure, sad)
3
desolate(adjective, sad, unhappy, unpleasant, woe)
3
destructive(adjective, bad, evil, negative, harmful)
3
difficult(adjective, hard, severe, offensive, distressing)
3
dim
3
direful(adjective, black, baleful, bodeful)
3
disgraceful(adjective, evil)
3
disturbing(adjective, hard, severe, nasty, offensive)
3
eldritch(adjective, bad, awful, disgusting, black)
3
execrable
3
frightful(adjective, appearance, awful, terrible, dreadful)
3
ghostly
3
ghoulish(adjective, nasty, awful, terrible, dreadful)
3
grotesque(adjective, black, baleful, bodeful)
3
hapless(adjective, sad, unhappy, unpleasant, woe)
3
hellish(adjective, nasty, vicious, wicked, hateful)
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APASmart Define. (2016). sinister thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/sinister/thesaurus/synonyms
ChicagoSmart Define. 2016. "sinister thesaurus" https://smartdefine.org/sinister/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2016, sinister thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/sinister/thesaurus/synonyms>.
MLASmart Define. "sinister thesaurus" 3 April 2016. Web. 23 September 2026. <https://smartdefine.org/sinister/thesaurus/synonyms>