65 entries under mystery topic. ×
| inscrutableness(difficulty, question, secret, puzzle, obscurity) | |
| mindboggler(difficulty, question, secret, puzzle, obscurity) | |
| occult(difficulty, question, confidence, secret, puzzle) | |
| oracle(difficulty, question, confidence, secret, puzzle) | |
| rune(difficulty, question, secret, puzzle, obscurity) | |
| secrecy(difficulty, question, secret, puzzle, obscurity) | |
| sphinx(difficulty, question, secret, puzzle, obscurity) | |
| subtlety(difficulty, question, secret, puzzle, obscurity) | |
| thriller(difficulty, question, secret, puzzle, obscurity) | |
| bugaboo(noun, challenge, question, puzzle) | |
| classified information(expression, confidence) | |
| cliff-hanger(noun, challenge, question, puzzle) | |
| confidence | |
| confidential information(expression, confidence) | |
| formula | |
| illustration(noun, challenge, question, puzzle) | |
| key | |
| magic number(expression, confidence) | |
| password | |
| privileged information(expression, confidence) |
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| APA | Smart Define. (2016). riddle thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/riddle/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "riddle thesaurus" https://smartdefine.org/riddle/thesaurus/synonyms (accessed September 28, 2026). |
| Harvard | Smart Define 2016, riddle thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/riddle/thesaurus/synonyms>. |
| MLA | Smart Define. "riddle thesaurus" 1 April 2016. Web. 28 September 2026. <https://smartdefine.org/riddle/thesaurus/synonyms> |