| calamity(noun, trouble, worry, difficulty, want) | |
| calvary(noun, trouble, blow, distress, care) | |
| can of worms(noun, expression, idiom, trouble, difficulty) | |
| care for truth(expression, idiom) | |
| carefulness(noun, care, correctness, precision, accuracy) | |
| case(trouble, difficulty, protest, lack, torment) | |
| catastrophe(noun, trouble, worry, difficulty, want) | |
| causticity | |
| circumstance(noun, difficulty, mess, hardship, jam) | |
| circumstantiality | |
| clutch(noun, difficulty, mess, hardship, jam) | |
| complexity | |
| condition(noun, difficulty, mess, hardship, jam) | |
| conventionalism(noun, severity, harshness, strictness, exactness) | |
| cool | |
| coolth | |
| corner(noun, difficulty, mess, hardship, jam) | |
| crisis(noun, difficulty, mess, hardship, jam) | |
| criticality | |
| criticalness |
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| APA | Smart Define. (2015). rigor thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/rigor/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "rigor thesaurus" https://smartdefine.org/rigor/thesaurus/synonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2015, rigor thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/rigor/thesaurus/synonyms>. |
| MLA | Smart Define. "rigor thesaurus" 13 April 2015. Web. 23 September 2026. <https://smartdefine.org/rigor/thesaurus/synonyms> |