7
noxious(adjective, awful, dirty, gloom, badly)
7
painful(adjective, endured, ugliness)
7
redoubtable(adjective, tough, difficult, awful, terrible)
7
unappetizing(adjective, dull, disgusting, ugly, bad-looking)
7
ungodly(adjective, unpleasant, awful, terrible, disgusting)
6
calamitous(adjective, offensive, unpleasant)
6
execrable(adjective, unpleasant, awful, terrible, disgusting)
6
insufferable(adjective, offensive, endured)
6
nightmarish(adjective, endured)
6
repellant(adjective, dull, disgusting, ugly, ugliness)
6
rotten(adjective, endured)
6
unprepossessing(adjective, dull, disgusting, ugly, revolting)
6
unsightly(adjective, appearance, dislike, disgusting, horrible)
5
Gorgonian(adjective, dull, disgusting, ugly, bad-looking)
5
acute(adjective, endured)
5
almighty(adjective, awful, terrible, horrible, afraid)
5
cringeworthy(adjective, terrible, dirty, badly, scary)
5
dark
5
daunting
5
deformed(adjective, appearance, dislike, disgusting, horrible)
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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>