- Definitions|2
- Thesaurus|931
- Abbreviations|0
72 entries under adjective topic. ×
| arcane(solid, dense) | |
| baffling(solid, dense) | |
| cabalistic(solid, dense) | |
| challenging(impossible, insuperable, insurmountable) | |
| close(solid, dense) | |
| concealed | |
| enigmatic(solid, dense) | |
| enigmatical(solid, dense) | |
| firm(solid, dense) | |
| hidden(solid, dense) | |
| inapproachable | |
| incognizable(solid, dense) | |
| indiscernible(solid, dense) | |
| inexplicable(solid, dense) | |
| inscrutable(solid, dense) | |
| mystic(solid, dense) | |
| overwhelming(hopeless, impossible, insuperable, insurmountable) | |
| sibylline(solid, dense) | |
| solid(dense, resistant, impervious) | |
| substantial(solid, dense) |
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| APA | Smart Define. (2015). impassable thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/impassable/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "impassable thesaurus" https://smartdefine.org/impassable/thesaurus/synonyms (accessed September 24, 2026). |
| Harvard | Smart Define 2015, impassable thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/impassable/thesaurus/synonyms>. |
| MLA | Smart Define. "impassable thesaurus" 14 April 2015. Web. 24 September 2026. <https://smartdefine.org/impassable/thesaurus/synonyms> |