Synonyms|250Antonyms|32|Broader|4Narrower|1Related|25
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algidity
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aplomb(firmness, rigidity, stiffness)
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asceticism
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assurance(firmness, rigidity, stiffness)
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austereness
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backbone(firmness, rigidity, stiffness)
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balance(firmness, rigidity, stiffness)
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barricade(difficulty, laboriousness, strenuousness)
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beastliness
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burliness
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callosity
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callousness
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care
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check(difficulty, laboriousness, strenuousness)
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chilling
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closeness
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clumsiness
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cohesion(firmness, rigidity, stiffness)
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cold-bloodedness
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constancy(firmness, rigidity, stiffness)
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APASmart Define. (2015). rigorousness thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/rigorousness/thesaurus/synonyms
ChicagoSmart Define. 2015. "rigorousness thesaurus" https://smartdefine.org/rigorousness/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2015, rigorousness thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/rigorousness/thesaurus/synonyms>.
MLASmart Define. "rigorousness thesaurus" 10 April 2015. Web. 21 September 2026. <https://smartdefine.org/rigorousness/thesaurus/synonyms>