41
ominous(adjective, person, appearance, mean, bad)
34
menacing(adjective, person, sad, dark, unpleasant)
29
scary(adjective, feeling, cause, fear, frightening)
26
evil(adjective, mean, bad, wrong, evil)
26
malevolent(adjective, person, mean, bad, wrong)
24
malicious(adjective, person, mean, bad, wrong)
23
wicked(adjective, mean, bad, wrong, evil)
23
foreboding(adjective, person, appearance, mean, bad)
21
threatening(adjective, person, mean, bad, wrong)
20
bad(adjective, evil, nasty, awful, corrupt)
20
disastrous(adjective, nasty, black, threatening, injurious)
19
baleful(adjective, nasty, sorrow, awful, terrible)
17
dire(adjective, evil, nasty, awful, black)
17
grim(adjective, person, appearance, sad, sorrow)
17
unlucky(adjective, evil, nasty, sad, unhappy)
17
pernicious(adjective, bad, evil, nasty, corrupt)
17
spiteful(adjective, person, evil, rough, nasty)
16
dark(adjective, evil, obscure, rough, nasty)
16
inauspicious(adjective, nasty, black, threatening, menacing)
16
mean(adjective, person, evil, nasty, harsh)
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APASmart Define. (2016). sinister thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/sinister/thesaurus/synonyms
ChicagoSmart Define. 2016. "sinister thesaurus" https://smartdefine.org/sinister/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2016, sinister thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/sinister/thesaurus/synonyms>.
MLASmart Define. "sinister thesaurus" 3 April 2016. Web. 20 September 2026. <https://smartdefine.org/sinister/thesaurus/synonyms>