44 entries under firmness topic. ×
| permanence | |
| resoluteness | |
| sharpness(rigidity, inflexibility) | |
| unkindness(rigidity, inflexibility) |
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| APA | Smart Define. (2015). stiffness thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/stiffness/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "stiffness thesaurus" https://smartdefine.org/stiffness/thesaurus/synonyms (accessed September 27, 2026). |
| Harvard | Smart Define 2015, stiffness thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/stiffness/thesaurus/synonyms>. |
| MLA | Smart Define. "stiffness thesaurus" 10 April 2015. Web. 27 September 2026. <https://smartdefine.org/stiffness/thesaurus/synonyms> |