- Definitions|1
- Thesaurus|312
- Abbreviations|0
| immovability(firmness, rigidity, stiffness) | |
| impasse(difficulty, laboriousness, strenuousness) | |
| inclementness | |
| incompressibility | |
| inelasticity(inflexibility, stiffness) | |
| inexorability | |
| inexorableness | |
| inhumanity | |
| insensibility | |
| klutziness | |
| knot(difficulty, laboriousness, strenuousness) | |
| labor(difficulty, laboriousness, strenuousness) | |
| lividness | |
| maturity(firmness, rigidity, stiffness) | |
| meanness | |
| mercilessness | |
| mess(difficulty, laboriousness, strenuousness) | |
| misfortune(difficulty, laboriousness, strenuousness) | |
| muddle(difficulty, laboriousness, strenuousness) | |
| obduracy |
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| APA | Smart Define. (2015). rigorousness thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/rigorousness/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "rigorousness thesaurus" https://smartdefine.org/rigorousness/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2015, rigorousness thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/rigorousness/thesaurus/synonyms>. |
| MLA | Smart Define. "rigorousness thesaurus" 10 April 2015. Web. 22 September 2026. <https://smartdefine.org/rigorousness/thesaurus/synonyms> |