- Definitions|1
- Thesaurus|1.2k
- Abbreviations|0
205 entries under adjective topic. ×
| impenetrable(obscure, solid, dark, superior) | |
| mysterious(solid, strange, secret, dense) | |
| unfathomable(hard, obscure, difficult, solid) | |
| unintelligible(obscure, solid, dark, superior) | |
| incomprehensible(obscure, solid, dark, strange) | |
| incognizable(solid, deep, dense, unfathomable) | |
| inconceivable(obscure, extraordinary, belief, fantastic) | |
| inscrutable(solid, strange, blank, dense) | |
| unknown(obscure, dark, superior, strange) | |
| arcane(solid, strange, odd, mysterious) | |
| enigmatic(obscure, solid, strange, odd) | |
| hidden(obscure, solid, dark, superior) | |
| strange(extraordinary, unbelievable, implausible, unfathomable) | |
| undiscoverable(difficult, ambiguous, hidden, unfathomable) | |
| unimaginable(extraordinary, strange, implausible, unfathomable) | |
| inexplicable(obscure, solid, dark, strange) | |
| mystic(obscure, solid, dark, superior) | |
| obscure(solid, dark, mysterious, unfathomable) | |
| transcendent | |
| unaccountable(solid, strange, mysterious, secret) |
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| APA | Smart Define. (2015). unknowable thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/unknowable/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "unknowable thesaurus" https://smartdefine.org/unknowable/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2015, unknowable thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/unknowable/thesaurus/synonyms>. |
| MLA | Smart Define. "unknowable thesaurus" 13 April 2015. Web. 22 September 2026. <https://smartdefine.org/unknowable/thesaurus/synonyms> |