- Definitions|2
- Thesaurus|347
- Abbreviations|0
60 entries under noun topic. ×
| imperviousness(protection, security, rigidity, hardness) | |
| obscurity(depth, incomprehensibility) | |
| density(mass, protection, security, rigidity) | |
| opacity | |
| impenetrableness | |
| impermeability(protection, security, rigidity, hardness) | |
| solidity(mass, protection, security, rigidity) | |
| thickness(mass, bulk, density, impermeability) | |
| callousness | |
| closeness(mass, bulk, density, thickness) | |
| complexity(incomprehensibility, elaborateness) | |
| crowdedness(mass, bulk, density, thickness) | |
| difficulty | |
| firmness(rigidity, hardness) | |
| hardness(protection, security, cruelty, rigidity) | |
| inscrutability | |
| intricacy | |
| resistance(protection, security, rigidity, hardness) | |
| toughness(protection, security, rigidity, hardness) | |
| consistency(mass, bulk, density, thickness) |
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| APA | Smart Define. (2015). impenetrability thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/impenetrability/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "impenetrability thesaurus" https://smartdefine.org/impenetrability/thesaurus/synonyms (accessed September 26, 2026). |
| Harvard | Smart Define 2015, impenetrability thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/impenetrability/thesaurus/synonyms>. |
| MLA | Smart Define. "impenetrability thesaurus" 14 April 2015. Web. 26 September 2026. <https://smartdefine.org/impenetrability/thesaurus/synonyms> |