Synonyms|103Antonyms|14|Broader|0Narrower|3Related|21
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villianousness(noun, wickedness, horror, barbarity)
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vindictiveness(noun, spite, malice, unkindness, nastiness)
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virulence
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APASmart Define. (2015). fiendishness thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/fiendishness/thesaurus/synonyms
ChicagoSmart Define. 2015. "fiendishness thesaurus" https://smartdefine.org/fiendishness/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2015, fiendishness thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/fiendishness/thesaurus/synonyms>.
MLASmart Define. "fiendishness thesaurus" 14 April 2015. Web. 24 September 2026. <https://smartdefine.org/fiendishness/thesaurus/synonyms>