| crabbedness | |
| crampedness | |
| crowdedness | |
| debasement | |
| deepness | |
| denseness | |
| dependability(noun, support, control, strength, balance) | |
| despotism(noun, abuse, misery, suffering, hardship) | |
| detachment(noun, insensitivity) | |
| dictatorship(noun, abuse, misery, suffering, hardship) | |
| difficultness | |
| dispassion(noun, insensitivity) | |
| distress(noun, difficulty, toughness) | |
| doggedness(noun, tenacity) | |
| dourness | |
| elasticity(firmness, texture, thickness, runniness) | |
| emotionlessness(noun, insensitivity) | |
| endurance(noun, support, control, strength, balance) | |
| esoterica | |
| establishment(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> |