4
awe-inspiring(adjective, severe, awful, terrible, horrible)
4
deplorable(adjective, endured)
4
desperate(adjective, awful, terrible, horrible, afraid)
4
grewsome(adjective, endured)
4
harsh(adjective, great, huge, endured, massive)
4
intense(adjective, great, severe, extreme, serious)
4
nauseous
4
spooky
4
tragic(adjective, awful, terrible, horrible, afraid)
4
unbearable(adjective, unpleasant, awful, terrible, disgusting)
4
unfortunate(adjective, endured)
4
woeful(adjective, awful, terrible, horrible, afraid)
3
agonizing(adjective, endured)
3
annoying(adjective, offensive)
3
baleful(adjective, awful, terrible, dreadful)
3
blatant(adjective, awful, terrible, horrible, afraid)
3
bloodcurdling(nasty, unpleasant, awful, terrible, unkind)
3
chronic(adjective, awful, terrible, horrible, afraid)
3
crashing(adjective, awful, terrible, horrible, afraid)
3
damnable(adjective, awful, terrible, horrible, afraid)
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APASmart Define. (2016). frightful thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/frightful/thesaurus/synonyms
ChicagoSmart Define. 2016. "frightful thesaurus" https://smartdefine.org/frightful/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2016, frightful thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/frightful/thesaurus/synonyms>.
MLASmart Define. "frightful thesaurus" 29 March 2016. Web. 24 September 2026. <https://smartdefine.org/frightful/thesaurus/synonyms>