22 entries under hardness topic. ×

20
rigidity(noun, state, quality, resist, firmness)
14
firmness(noun, resolve, determination, severity, tension)
9
stiffness(noun, firmness, protection, severity, security)
8
hardness(noun, firmness, protection, severity, security)
7
inelasticity(noun, protection, security, rigidity)
5
fixedness(noun, resolve, resolution, protection, security)
5
toughness(noun, determination, firmness, protection, severity)
2
impliability(noun, protection, security, rigidity)
2
solidity(noun, firmness, protection, security, toughness)
2
temper(noun, protection, security, rigidity)
1
callosity
1
compactness(noun, protection, security, rigidity)
1
density(noun, protection, security, rigidity)
1
durability(noun, firmness, protection, security, toughness)
1
impenetrability(noun, protection, security, rigidity)
1
impermeability(noun, protection, security, rigidity)
1
imperviousness(noun, protection, security, rigidity)
1
resistance(noun, firmness, protection, security, toughness)
1
tensile strength(noun, expression, protection, security, rigidity)
0
durity
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APASmart Define. (2015). inflexibility thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/inflexibility/thesaurus/synonyms
ChicagoSmart Define. 2015. "inflexibility thesaurus" https://smartdefine.org/inflexibility/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2015, inflexibility thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/inflexibility/thesaurus/synonyms>.
MLASmart Define. "inflexibility thesaurus" 14 April 2015. Web. 25 September 2026. <https://smartdefine.org/inflexibility/thesaurus/synonyms>