5
mummified(adjective, person, unwarmhearted)
5
perverse(adjective, nasty, wicked, menacing)
5
scandalous(adjective, unpleasant, corrupt, wicked, horrible)
5
somber(adjective, sorrow, depress, sadness, emotion)
5
standoffish(adjective, person, unwarmhearted)
5
terrible(adjective, appearance, evil, unpleasant, awful)
5
terrifying(adjective, bad, awful, disgusting, sinful)
5
uncordial(adjective, person, unwarmhearted)
5
unscrupulous(adjective, false, corrupt, dishonest, immoral)
5
unwarmhearted(adjective, person, negative)
4
hostile(adjective, mean, bad, wrong, evil)
4
left(adjective, sinistrality)
4
nasty(adjective, evil, rough, dark, unpleasant)
4
appalling(awful, terrible, dreadful)
4
damnable(adjective, evil, wicked)
4
depraved(adjective, wicked)
4
dreadful(adjective, nasty, unpleasant, awful, terrible)
4
fatal
4
hair-raising(adjective, bad, awful, disgusting, sinful)
4
hopeless(adjective, appearance, obscure, sad, dark)
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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>