0
gruesomely(adverb, shockingly, appallingly, repulsively, revoltingly)
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harrowingly
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hilariously
0
horrendously(adverb, appallingly)
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horrible
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horribly(adverb, violently, beastly, mightily, shockingly)
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horridly
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horrified
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horrifies
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horrify
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horrifying
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intimidate
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intimidating
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menacingly
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mitigate
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nightmarishly
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ominous
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ominously
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overwhelmingly
0
paranormally
11 years ago|2.4k views|share |citing 
APASmart Define. (2015). frighteningly thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/frighteningly/thesaurus/synonyms
ChicagoSmart Define. 2015. "frighteningly thesaurus" https://smartdefine.org/frighteningly/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2015, frighteningly thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/frighteningly/thesaurus/synonyms>.
MLASmart Define. "frighteningly thesaurus" 14 April 2015. Web. 25 September 2026. <https://smartdefine.org/frighteningly/thesaurus/synonyms>