Synonyms|116Antonyms|53|Broader|4Narrower|1Related|173
8
imperviousness(noun, protection, security, rigidity, hardness)
8
obscurity(noun, depth, incomprehensibility)
6
density(noun, mass, protection, security, rigidity)
6
opacity(noun, incomprehensibility)
5
abstruseness
5
impenetrableness
4
cohesion
4
impermeability(noun, protection, security, rigidity, hardness)
4
profoundness
4
solidity(noun, mass, protection, security, rigidity)
3
ambiguity
3
deepness
3
thickness(noun, mass, bulk, density, impermeability)
2
callousness(noun, cruelty)
2
closeness(noun, mass, bulk, density, thickness)
2
complexity(noun, incomprehensibility, elaborateness)
2
complicatedness
2
crowdedness(noun, mass, bulk, density, thickness)
2
difficulty
2
firmness(noun, rigidity, hardness)
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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>