| complication(noun, trouble, blow, distress, care) | |
| coolness(noun, coldness, nip) | |
| crispness(noun, coldness, coolness, nip) | |
| cross(protest, objection, complaint) | |
| curse(trouble, difficulty, lack, torment, adversity) | |
| detail(noun, distinction, refinement, precision) | |
| downer(noun, trouble, difficulty, drag, hardship) | |
| exactingness(severity, strictness, sternness) | |
| extremity(noun, difficulty, predicament, crisis) | |
| faithfulness(noun, correctness, precision, accuracy) | |
| fidelity(noun, care, exactness) | |
| force | |
| frigidity(noun, coldness, coolness, nip) | |
| frostiness(noun, coldness, coolness) | |
| gelidity(noun, coldness, coolness, nip) | |
| ghastliness | |
| gracelessness | |
| hard knocks(noun, expression, trouble, difficulty, want) | |
| iciness(noun, coldness, coolness, nip) | |
| intensity |
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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> |