28 entries under challenge topic. ×
| riddle(noun, trouble, show, difficulty) | |
| mystery(noun, trouble, show, dispute, difficulty) | |
| conundrum(noun, trouble, show, difficulty, difficult) | |
| puzzle(noun, trouble, show, dispute, difficulty) | |
| secret(noun, trouble, question, puzzle) | |
| problem(noun, trouble, difficulty, issue) | |
| brain-teaser(noun, trouble, difficult, issue) | |
| closed book(noun, expression, idiom, trouble) | |
| paradox(noun, trouble, question, problem) | |
| question(noun, trouble, doubt, problem) | |
| puzzlement(noun, trouble, question, secret) | |
| poser(noun, trouble, difficulty, question) | |
| puzzler(noun, show, difficulty, difficult, issue) | |
| mystification(noun, trouble, question, secret) | |
| stumper(noun, trouble, difficulty, difficult, issue) | |
| why(noun, trouble, informal, question) | |
| dilemma(noun, trouble, difficult, issue) | |
| crux(noun, trouble, question, secret) | |
| brainteaser(noun, difficulty, difficult, issue) | |
| teaser(noun, difficulty, difficult, issue) |
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| APA | Smart Define. (2016). enigma thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/enigma/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "enigma thesaurus" https://smartdefine.org/enigma/thesaurus/synonyms (accessed September 24, 2026). |
| Harvard | Smart Define 2016, enigma thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/enigma/thesaurus/synonyms>. |
| MLA | Smart Define. "enigma thesaurus" 1 April 2016. Web. 24 September 2026. <https://smartdefine.org/enigma/thesaurus/synonyms> |