- Definitions|2
- Thesaurus|931
- Abbreviations|0
| spirited | |
| staunch | |
| steadfast | |
| strong | |
| submersible | |
| substantial(adjective, solid, dense) | |
| tightly packed(expression, adjective, solid, dense) | |
| tough | |
| two-way | |
| unaccountable(adjective, solid, dense) | |
| unaffected(unyielding, unbending, resistant, unreceptive) | |
| unassailable | |
| unbeatable(adjective, strong, secure, resolute, steadfast) | |
| unbending(unyielding, unreceptive) | |
| undefeatable(adjective, strong, secure, resolute, steadfast) | |
| unfathomable(adjective, solid, dense) | |
| unfeasible | |
| unfeeling(unyielding, unbending, unreceptive) | |
| unflinching | |
| ungraspable(adjective, solid, dense) |
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| APA | Smart Define. (2015). impassable thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/impassable/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "impassable thesaurus" https://smartdefine.org/impassable/thesaurus/synonyms (accessed September 21, 2026). |
| Harvard | Smart Define 2015, impassable thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/impassable/thesaurus/synonyms>. |
| MLA | Smart Define. "impassable thesaurus" 14 April 2015. Web. 21 September 2026. <https://smartdefine.org/impassable/thesaurus/synonyms> |