2
hazardous
2
hinting(verb, adjective, threatening)
2
nauseating(adjective, awful, terrible, grim, shocking)
2
nerve-racking
2
nerve-wracking
2
nightmarish(adjective, nasty, awful, terrible, unreasonable)
2
pessimistic(hard, severe, offensive, distressing, upsetting)
2
redoubtable
2
revolting
2
risky
2
severe(adjective, hard, offensive, dark, violent)
2
terrorizing(noun, verb, adjective, mean, sharp)
2
tormenting(verb, adjective, threatening)
2
touchy
2
uncanny(adjective, awful, terrible, unreasonable, shocking)
2
uncertain(hard, severe, offensive, distressing, upsetting)
2
unnatural(awful, terrible, grim, shocking, upsetting)
2
warning(verb, adjective, threatening)
2
worrisome(adjective, hard, severe, offensive, distressing)
1
abject
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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>