- Definitions|2
- Thesaurus|347
- Abbreviations|0
| hardness(noun, protection, security, cruelty, rigidity) | |
| inscrutability | |
| inscrutableness | |
| intricacy(noun, incomprehensibility) | |
| perplexity | |
| profundity | |
| reconditeness | |
| resistance(noun, protection, security, rigidity, hardness) | |
| toughness(noun, protection, security, rigidity, hardness) | |
| consistency(noun, mass, bulk, density, thickness) | |
| body(noun, mass, bulk, density, thickness) | |
| compactness(noun, mass, protection, security, rigidity) | |
| complication | |
| concretion(noun, mass, bulk, density, thickness) | |
| congestion | |
| consistence | |
| constipation | |
| denseness(noun, mass, bulk, density, thickness) | |
| dimness | |
| durability(noun, protection, security, rigidity, hardness) |
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| APA | Smart Define. (2015). impenetrability thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/impenetrability/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "impenetrability thesaurus" https://smartdefine.org/impenetrability/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2015, impenetrability thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/impenetrability/thesaurus/synonyms>. |
| MLA | Smart Define. "impenetrability thesaurus" 14 April 2015. Web. 22 September 2026. <https://smartdefine.org/impenetrability/thesaurus/synonyms> |