39 entries under question topic. ×
| closed book(expression, secret, puzzle, subtlety) | |
| mystery(noun, difficulty, confidence, secret) | |
| secret(noun, confidence, puzzle, obscurity) | |
| tough nut to crack(expression, idiom, difficulty, secret) | |
| sixty-four-thousand-dollar question(expression, secret, puzzle, subtlety) | |
| abstruseness(difficulty, secret, puzzle, subtlety) | |
| brainteaser(difficulty, secret, puzzle, subtlety) | |
| braintwister(difficulty, secret, puzzle, subtlety) | |
| charade(difficulty, secret, puzzle, subtlety) | |
| chiller(difficulty, secret, puzzle, subtlety) | |
| cliffhanger(difficulty, secret, puzzle, obscurity) | |
| crux(difficulty, secret, puzzle, obscurity) | |
| cryptogram(difficulty, secret, puzzle, obscurity) | |
| difficulty(secret, puzzle, obscurity, subtlety) | |
| grabber(difficulty, secret, puzzle, obscurity) | |
| inscrutability(difficulty, secret, puzzle, subtlety) | |
| inscrutableness(difficulty, secret, puzzle, subtlety) | |
| mindboggler(difficulty, secret, puzzle, subtlety) | |
| mystification(secret, puzzle, obscurity, subtlety) | |
| occult(difficulty, secret, puzzle, subtlety) |
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| APA | Smart Define. (2015). oracle thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/oracle/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "oracle thesaurus" https://smartdefine.org/oracle/thesaurus/synonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2015, oracle thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/oracle/thesaurus/synonyms>. |
| MLA | Smart Define. "oracle thesaurus" 13 April 2015. Web. 23 September 2026. <https://smartdefine.org/oracle/thesaurus/synonyms> |