3
darn(adjective, awful, terrible, horrible, afraid)
3
deterring
3
deuced(adjective, awful, terrible, horrible, afraid)
3
disagreeable(adjective, person, hard, severe, dark)
3
disconcerting(adjective, hard, severe, offensive, distressing)
3
disquieting(adjective, hard, severe, offensive, shocking)
3
doggone(adjective, awful, terrible, horrible, afraid)
3
dour(adjective, person, feelings)
3
enormous(adjective, awful, terrible, horrible, afraid)
3
execrable(adjective, awful, terrible, horrible, afraid)
3
fierce(adjective, violent, hostile, brutal, belligerent)
3
flagrant(adjective, awful, terrible, horrible, afraid)
3
gastful(adjective, awful, terrible, horrible, afraid)
3
ghastful(adjective, awful, terrible, horrible, afraid)
3
ghostly(adjective, unreasonable, shocking, inappropriate, absurd)
3
god awful(adjective, awful, terrible, horrible, afraid)
3
grizzly(adjective, awful, terrible, horrible, afraid)
3
gross(adjective, awful, terrible, horrible, afraid)
3
grotesque
3
grueling(adjective, awful, terrible, horrible, afraid)
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APASmart Define. (2016). frightening thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/frightening/thesaurus/synonyms
ChicagoSmart Define. 2016. "frightening thesaurus" https://smartdefine.org/frightening/thesaurus/synonyms (accessed September 26, 2026).
HarvardSmart Define 2016, frightening thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/frightening/thesaurus/synonyms>.
MLASmart Define. "frightening thesaurus" 23 March 2016. Web. 26 September 2026. <https://smartdefine.org/frightening/thesaurus/synonyms>