3
tragical(adjective, awful, terrible, horrible, afraid)
3
unearthly(adjective, awful, terrible, unreasonable, shocking)
3
unpleasant(adjective, person, hard, severe, feelings)
3
unspeakable(adjective, bad)
3
upsetting(adjective, hard, severe, offensive, disgusting)
3
very bad(adjective, awful, terrible, horrible, afraid)
3
woesome(adjective, awful, terrible, horrible, afraid)
3
worrying(adjective, hard, severe, offensive, distressing)
2
admonishing(verb, adjective, threatening)
2
agitating(verb, hard, severe, offensive, distressing)
2
astonishing(adjective, awful, wonderful, amazing, grand)
2
astounding(adjective, awful, terrible, disgusting, grand)
2
blood-curdling
2
demoralizing(adjective, pressure, threats)
2
fear(verb, pressure, threats)
2
fear-inspiring
2
forewarning(verb, adjective, threatening)
2
foul
2
gloomy(hard, severe, offensive, dark, hostile)
2
harassing(verb, hard, severe, offensive, distressing)
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APASmart Define. (2016). frightening thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/frightening/thesaurus/synonyms
ChicagoSmart Define. 2016. "frightening thesaurus" https://smartdefine.org/frightening/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2016, frightening thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/frightening/thesaurus/synonyms>.
MLASmart Define. "frightening thesaurus" 23 March 2016. Web. 27 September 2026. <https://smartdefine.org/frightening/thesaurus/synonyms>