- Definitions|2
- Thesaurus|931
- Abbreviations|0
| unsurmountable(adjective, impossibility) | |
| blockaded(adjective, closed) | |
| compact(adjective, solid, dense) | |
| forbidden(adjective, closed) | |
| imperviable(unaffected, unyielding, unbending, resistant, unreceptive) | |
| impossible(adjective, unreasonable, useless, absurd, hopeless) | |
| impracticable | |
| incomprehensible(adjective, solid, dense) | |
| invulnerable(adjective, strong, resolute, unaffected, unyielding) | |
| murky(adjective, solid, dense) | |
| mysterious(adjective, solid, dense) | |
| sealed(adjective, unaffected, unyielding, unbending, resistant) | |
| tight(unaffected, unyielding, unbending, resistant, unreceptive) | |
| unattainable(adjective, inaccessible, impossible, impossibility) | |
| untrodden(adjective, closure, closed) | |
| blind(adjective, hidden, covered) | |
| bulletproof(adjective, solid, dense, untouchable, invincible) | |
| compressed | |
| death | |
| desperate |
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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> |