| strenuousness(noun, difficulty, toughness) | |
| temper(noun, protection, security, rigidity, density) | |
| tenacity(noun, severity, harshness, conformity, strictness) | |
| brutality(noun, power, abuse, violence, misery) | |
| complication(noun, difficulty, toughness) | |
| hardheartedness(noun, discipline, firmness, severity, cruelty) | |
| impenitence(noun, impenitence) | |
| oppressiveness(noun, difficulty) | |
| pitilessness(noun, coldness) | |
| resistance(noun, firmness, protection, security, toughness) | |
| severeness | |
| strictness(noun, easy, condition, discipline, firmness) | |
| viscidity(noun, firmness, tenacity, texture, thickness) | |
| acerbity(noun, discipline, firmness, severity, harshness) | |
| apathy(noun, insensitivity) | |
| awkwardness(noun, difficulty, toughness) | |
| cohesion(noun, support, control, strength, balance) | |
| cold-bloodedness(noun, cruelty, insensitivity) | |
| complexity(noun, difficulty) | |
| consistence |
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| APA | Smart Define. (2015). hardness thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/hardness/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "hardness thesaurus" https://smartdefine.org/hardness/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2015, hardness thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/hardness/thesaurus/synonyms>. |
| MLA | Smart Define. "hardness thesaurus" 14 April 2015. Web. 22 September 2026. <https://smartdefine.org/hardness/thesaurus/synonyms> |