- Definitions|2
- Thesaurus|246
- Abbreviations|0
11 entries under impenetrable topic. ×
| cryptic(adjective, dark, uncertain, mysterious, unfathomable) | |
| mysterious(adjective, solid, dark, uncertain, dense) | |
| Delphic(solid, dense, unfathomable, unintelligible) | |
| baffling(solid, dense, unfathomable, unintelligible) | |
| incognizable(solid, dense, unfathomable, unintelligible) | |
| perplexing(dark, uncertain, mysterious, unfathomable) | |
| puzzling(dark, uncertain, mysterious, unfathomable) | |
| unfathomable(solid, dark, uncertain, mysterious, dense) | |
| ungraspable(solid, dense, unfathomable, unintelligible) | |
| unintelligible(solid, dark, uncertain, mysterious, dense) | |
| unknowable(solid, dense, unfathomable, unintelligible) |
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| APA | Smart Define. (2015). sibylline thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/sibylline/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "sibylline thesaurus" https://smartdefine.org/sibylline/thesaurus/synonyms (accessed September 26, 2026). |
| Harvard | Smart Define 2015, sibylline thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/sibylline/thesaurus/synonyms>. |
| MLA | Smart Define. "sibylline thesaurus" 14 April 2015. Web. 26 September 2026. <https://smartdefine.org/sibylline/thesaurus/synonyms> |