- Definitions|2
- Thesaurus|246
- Abbreviations|0
8 entries under impassable topic. ×
| mystic(adjective, solid, dense, psychic, clairvoyant) | |
| Delphic(solid, dense, unfathomable, impenetrable, unintelligible) | |
| baffling(solid, dense, unfathomable, impenetrable, unintelligible) | |
| incognizable(solid, dense, unfathomable, impenetrable, unintelligible) | |
| ungraspable(solid, dense, unfathomable, impenetrable, unintelligible) | |
| unknowable(solid, dense, unfathomable, impenetrable, unintelligible) | |
| enigmatical(solid, dense, unfathomable, unintelligible) | |
| indiscernible(solid, dense, unfathomable, unintelligible) |
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| APA | Smart Define. (2015). sibylline thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/sibylline/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "sibylline thesaurus" https://smartdefine.org/sibylline/thesaurus/synonyms (accessed September 24, 2026). |
| Harvard | Smart Define 2015, sibylline thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/sibylline/thesaurus/synonyms>. |
| MLA | Smart Define. "sibylline thesaurus" 14 April 2015. Web. 24 September 2026. <https://smartdefine.org/sibylline/thesaurus/synonyms> |