38 entries under secret topic. ×
| closed book(expression, question, puzzle, subtlety) | |
| mystery(noun, difficulty, question, confidence) | |
| tough nut to crack(expression, idiom, difficulty, question) | |
| sixty-four-thousand-dollar question(expression, question, puzzle, subtlety) | |
| abstruseness(difficulty, question, puzzle, subtlety) | |
| brainteaser(difficulty, question, puzzle, subtlety) | |
| braintwister(difficulty, question, puzzle, subtlety) | |
| charade(difficulty, question, puzzle, subtlety) | |
| chiller(difficulty, question, puzzle, subtlety) | |
| cliffhanger(difficulty, question, puzzle, obscurity) | |
| crux(difficulty, question, puzzle, obscurity) | |
| cryptogram(difficulty, question, puzzle, obscurity) | |
| difficulty(question, puzzle, obscurity, subtlety) | |
| grabber(difficulty, question, puzzle, obscurity) | |
| inscrutability(difficulty, question, puzzle, subtlety) | |
| inscrutableness(difficulty, question, puzzle, subtlety) | |
| mindboggler(difficulty, question, puzzle, subtlety) | |
| mystification(question, puzzle, obscurity, subtlety) | |
| occult(difficulty, question, puzzle, subtlety) | |
| perplexity(noun, difficulty, question, puzzle) |
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| APA | Smart Define. (2015). oracle thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/oracle/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "oracle thesaurus" https://smartdefine.org/oracle/thesaurus/synonyms (accessed September 26, 2026). |
| Harvard | Smart Define 2015, oracle thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/oracle/thesaurus/synonyms>. |
| MLA | Smart Define. "oracle thesaurus" 13 April 2015. Web. 26 September 2026. <https://smartdefine.org/oracle/thesaurus/synonyms> |