Synonyms|103Antonyms|14|Broader|0Narrower|3Related|21
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horribleness
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horridness
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hostility
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inhumanness
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iniquity
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insensitivity(cruelty, harshness, unkindness)
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maliciousness
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malignance
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malignancy
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meanness(noun, spite, malice, unkindness, nastiness)
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nastiness(noun, cruelty, spite, harshness, malice)
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nefariousness(noun, wickedness, horror, barbarity)
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nightmarishness
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oppression
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outrage
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perversity
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poison
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ruffianism
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shockingness(noun, wickedness, horror, barbarity)
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villainy
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APASmart Define. (2015). fiendishness thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/fiendishness/thesaurus/synonyms
ChicagoSmart Define. 2015. "fiendishness thesaurus" https://smartdefine.org/fiendishness/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2015, fiendishness thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/fiendishness/thesaurus/synonyms>.
MLASmart Define. "fiendishness thesaurus" 14 April 2015. Web. 23 September 2026. <https://smartdefine.org/fiendishness/thesaurus/synonyms>