- Definitions|2
- Thesaurus|931
- Abbreviations|0
| beyond control(expression, idiom, impossibility) | |
| cabalistic(adjective, solid, dense) | |
| caecal | |
| challenging(adjective, impossible, insuperable, insurmountable) | |
| choking | |
| clogged | |
| closable | |
| close(adjective, solid, dense) | |
| closed at one end(expression, idiom, dark) | |
| closed to(expression, unaffected, unyielding, unbending, resistant) | |
| concealed(adjective, dark) | |
| condensed | |
| congested | |
| crowded | |
| dead end(expression, dark) | |
| determined | |
| die | |
| dim | |
| disguised | |
| doughty |
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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> |