Synonyms|704Antonyms|216|Broader|11Narrower|13Related|1.5k

50 entries under adverb topic. ×

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formidably
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frighteningly
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frightfully
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gravely
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greatly
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grievously
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grimly
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grossly
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gruesomely
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hardly
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harshly
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hideously
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horribly
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horridly
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impossibly
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ominously
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painfully
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sadly
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seriously
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severely
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APASmart Define. (2016). frightful thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/frightful/thesaurus/synonyms
ChicagoSmart Define. 2016. "frightful thesaurus" https://smartdefine.org/frightful/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2016, frightful thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/frightful/thesaurus/synonyms>.
MLASmart Define. "frightful thesaurus" 29 March 2016. Web. 27 September 2026. <https://smartdefine.org/frightful/thesaurus/synonyms>