48 entries under secret topic. ×
| oracle(difficulty, question, confidence, puzzle) | |
| rune(difficulty, question, puzzle, obscurity) | |
| secrecy(difficulty, question, puzzle, obscurity) | |
| sixty-four-thousand-dollar question(expression, difficulty, question, puzzle) | |
| sphinx(difficulty, question, puzzle, obscurity) | |
| subtlety(difficulty, question, puzzle, obscurity) | |
| thriller(difficulty, question, puzzle, obscurity) | |
| crux criticorum(expression, idiom) |
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| APA | Smart Define. (2016). riddle thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/riddle/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "riddle thesaurus" https://smartdefine.org/riddle/thesaurus/synonyms (accessed September 26, 2026). |
| Harvard | Smart Define 2016, riddle thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/riddle/thesaurus/synonyms>. |
| MLA | Smart Define. "riddle thesaurus" 1 April 2016. Web. 26 September 2026. <https://smartdefine.org/riddle/thesaurus/synonyms> |