| seared conscience(expression, idiom, impenitence) | |
| steadiness(noun, support, control, change, strength) | |
| stoutness | |
| substantiality(noun, support, control, strength, balance) | |
| sureness(noun, support, control, change, strength) | |
| abrasiveness | |
| abstruseness | |
| adversity(noun, difficulty, toughness) | |
| badness | |
| callus | |
| clumsiness | |
| cogency | |
| coldness(severity, strictness, sternness) | |
| compactness(noun, firmness, protection, security, rigidity) | |
| contrariness(noun, difficulty) | |
| cruel-heartedness(noun, quality, cruelty, atrocity, inhumanity) | |
| cumbersomeness(noun, difficulty) | |
| density(noun, firmness, protection, security, rigidity) | |
| determination(noun, support, control, strength, balance) | |
| durability(noun, support, control, strength, balance) |
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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> |