- Definitions|2
- Thesaurus|347
- Abbreviations|0
60 entries under noun topic. ×
| tensile strength(expression, protection, security, rigidity) | |
| tightness(mass, bulk, density, thickness) | |
| airtightness(protection, security, impermeability, waterproofness) | |
| bulk(mass, density, thickness, impermeability) | |
| cold-bloodedness | |
| concentration(mass, thickness) | |
| concreteness(mass, thickness) | |
| darkness | |
| hardheartedness | |
| mass(bulk, density, thickness, impermeability) | |
| massiveness(mass, bulk, density, thickness) | |
| protection(security, waterproofness) | |
| remorselessness | |
| ruthlessness | |
| security(protection, waterproofness) | |
| stiffness(protection, security, rigidity, hardness) | |
| uncaringness | |
| unfeelingness | |
| waterproofness(protection, security) | |
| watertightness(protection, security, waterproofness) |
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| APA | Smart Define. (2015). impenetrability thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/impenetrability/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "impenetrability thesaurus" https://smartdefine.org/impenetrability/thesaurus/synonyms (accessed September 29, 2026). |
| Harvard | Smart Define 2015, impenetrability thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/impenetrability/thesaurus/synonyms>. |
| MLA | Smart Define. "impenetrability thesaurus" 14 April 2015. Web. 29 September 2026. <https://smartdefine.org/impenetrability/thesaurus/synonyms> |