- Definitions|1
- Thesaurus|1k
- Abbreviations|0
| secret(unfathomable, enigmatic, sphinx-like) | |
| serious(adjective, impassive, deadpan, stony, poker-faced) | |
| sphinx-like(unfathomable, enigmatic) | |
| sphinxlike(ambiguous, unfathomable, enigmatic, sphinx-like) | |
| spidery | |
| stony(adjective, impassive, deadpan, poker-faced, unsmiling) | |
| turgid | |
| unaccountable(unfathomable, enigmatic, sphinx-like) | |
| undiscoverable(ambiguous, unfathomable, enigmatic, sphinx-like) | |
| unexplainable(ambiguous, unfathomable, enigmatic, sphinx-like) | |
| unexplained | |
| unresponsive | |
| unsmiling | |
| vacant |
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| APA | Smart Define. (2016). unreadable thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/unreadable/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "unreadable thesaurus" https://smartdefine.org/unreadable/thesaurus/synonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2016, unreadable thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/unreadable/thesaurus/synonyms>. |
| MLA | Smart Define. "unreadable thesaurus" 10 March 2016. Web. 23 September 2026. <https://smartdefine.org/unreadable/thesaurus/synonyms> |