| subtlety(noun, distinction, refinement, precision) | |
| suffering(noun, trouble, blow, distress, care) | |
| tautness(firmness, rigidity) | |
| tenacity(noun, severity, harshness, strictness, exactness) | |
| tension(firmness, rigidity) | |
| thoroughness(noun, care, severity, harshness, correctness) | |
| abrasiveness | |
| absolute zero | |
| absoluteness | |
| abstruseness | |
| acidity | |
| acridity | |
| acuteness | |
| adverse circumstances | |
| aggravation | |
| albatross(noun, trouble, blow, distress, care) | |
| algidity | |
| anchoritic monasticism | |
| anchoritism | |
| anguish(noun, trouble, blow, distress, care) |
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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> |