21 entries under security topic. ×

8
imperviousness(noun, protection, rigidity, hardness)
6
density(noun, mass, protection, rigidity)
4
impermeability(noun, protection, rigidity, hardness)
4
solidity(noun, mass, protection, rigidity)
2
hardness(noun, protection, cruelty, rigidity)
2
resistance(noun, protection, rigidity, hardness)
2
toughness(noun, protection, rigidity, hardness)
1
compactness(noun, mass, protection, rigidity)
1
durability(noun, protection, rigidity, hardness)
1
fixedness(noun, protection, rigidity, hardness)
1
impliability(noun, protection, rigidity, hardness)
1
inelasticity(noun, protection, rigidity, hardness)
1
inflexibility(noun, protection, rigidity, hardness)
1
rigidity(noun, protection, hardness, density)
1
temper(noun, protection, rigidity, hardness)
1
tensile strength(noun, expression, protection, rigidity)
0
airtightness(noun, protection, impermeability, waterproofness)
0
protection(noun, waterproofness)
0
stiffness(noun, protection, rigidity, hardness)
0
waterproofness(noun, protection)
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APASmart Define. (2015). impenetrability thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/impenetrability/thesaurus/synonyms
ChicagoSmart Define. 2015. "impenetrability thesaurus" https://smartdefine.org/impenetrability/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2015, impenetrability thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/impenetrability/thesaurus/synonyms>.
MLASmart Define. "impenetrability thesaurus" 14 April 2015. Web. 21 September 2026. <https://smartdefine.org/impenetrability/thesaurus/synonyms>