| cross to bear(noun, expression, idiom, trouble, blow) | |
| crucible(noun, trouble, blow, distress, care) | |
| cruelness | |
| crunch(noun, trouble, difficulty, drag, hardship) | |
| cryogenics | |
| cryology | |
| danger(noun, trouble, worry, difficulty, want) | |
| deadlock(noun, difficulty, mess, hardship, jam) | |
| decrease in temperature(expression, idiom) | |
| deep water(noun, expression, difficulty, mess, hardship) | |
| destitution(noun, trouble, worry, difficulty, want) | |
| destructiveness | |
| difficult situation(noun, expression, difficulty, mess, hardship) | |
| difficulties | |
| difficultness | |
| dilemma(noun, difficulty, mess, hardship, jam) | |
| disaster(noun, trouble, worry, difficulty, want) | |
| drag(noun, trouble, blow, difficulty, distress) | |
| edge | |
| emergency(noun, difficulty, mess, hardship, jam) |
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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> |