| animality | |
| arrogance | |
| atrocity | |
| attention to fact(expression, idiom) | |
| ax to grind(expression, idiom, protest, objection, complaint) | |
| bad luck(noun, expression, trouble, difficulty, drag) | |
| bad news(noun, expression, difficulty, mess, hardship) | |
| bane(noun, trouble, blow, distress, care) | |
| barbarity | |
| big problem(noun, expression, trouble, blow, distress) | |
| bind(noun, difficulty, mess, hardship, jam) | |
| bitterness | |
| bleakness | |
| bloodlust | |
| blow(noun, trouble, distress, care, burden) | |
| bother(noun, trouble, blow, distress, care) | |
| bothersomeness | |
| briskness | |
| burden(noun, trouble, blow, distress, care) | |
| burdensomeness |
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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> |