| inflexibility(noun, firmness, severity, harshness, strictness) | |
| nicety(noun, point, care, truth, distinction) | |
| ordeal(noun, trouble, blow, distress, care) | |
| punctuality(noun, truth) | |
| rigidness(noun, obstinacy, stubbornness) | |
| severeness | |
| sharpness(noun, discipline, firmness, severity, harshness) | |
| toughness(noun, easy, condition, discipline, firmness) | |
| validity | |
| violence(noun, protest, objection, complaint) | |
| acerbity(noun, discipline, firmness, severity, harshness) | |
| acrimony | |
| astringency | |
| conscientiousness(noun, severity, harshness, strictness, exactness) | |
| grievance(noun, trouble, difficulty, protest, lack) | |
| meticulousness(noun, care, distinction, refinement, severity) | |
| obduracy(noun, severity, harshness, strictness, obstinacy) | |
| pitilessness | |
| predicament(noun, difficulty, mess, situation, jam) | |
| punctiliousness(noun, severity, harshness, strictness, exactness) |
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| APA | Smart Define. (2015). rigor thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/rigor/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "rigor thesaurus" https://smartdefine.org/rigor/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2015, rigor thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/rigor/thesaurus/synonyms>. |
| MLA | Smart Define. "rigor thesaurus" 13 April 2015. Web. 22 September 2026. <https://smartdefine.org/rigor/thesaurus/synonyms> |