44 entries under secret topic. ×
| enigma(noun, difficulty, question, puzzle) | |
| closed book(expression, difficulty, question, puzzle) | |
| riddle(noun, difficulty, question, puzzle) | |
| stumper(difficulty, question, puzzle, knot) | |
| teaser(difficulty, question, puzzle, knot) | |
| tough nut to crack(expression, idiom, question, puzzle) | |
| chiller(difficulty, question, puzzle, obscurity) | |
| cliffhanger(difficulty, question, puzzle, knot) | |
| crux(difficulty, question, puzzle, knot) | |
| cryptogram(difficulty, question, puzzle, knot) | |
| difficulty(question, puzzle, obscurity, subtlety) | |
| grabber(difficulty, question, puzzle, knot) | |
| inscrutability(difficulty, question, puzzle, perplexity) | |
| inscrutableness(difficulty, question, puzzle, perplexity) | |
| mindboggler(difficulty, question, puzzle, perplexity) | |
| mystification(question, puzzle, obscurity, knot) | |
| occult(difficulty, question, puzzle, perplexity) | |
| oracle(difficulty, question, puzzle, obscurity) | |
| perplexity(noun, difficulty, question, puzzle) | |
| poser(difficulty, question, puzzle, obscurity) |
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| APA | Smart Define. (2015). sphinx thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/sphinx/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "sphinx thesaurus" https://smartdefine.org/sphinx/thesaurus/synonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2015, sphinx thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/sphinx/thesaurus/synonyms>. |
| MLA | Smart Define. "sphinx thesaurus" 13 April 2015. Web. 23 September 2026. <https://smartdefine.org/sphinx/thesaurus/synonyms> |