28 entries under challenge topic. ×
| head-scratcher(noun, trouble, difficult, issue) | |
| difficulty(noun, trouble, difficult, issue) | |
| twister(noun, difficulty, difficult, issue) | |
| quandary(noun, trouble, difficult, issue) | |
| mind-boggler(noun, question, problem, secret) | |
| vexed question(noun, expression, idiom, trouble) | |
| difficult question(noun, trouble, question, puzzle) | |
| grabber(noun, difficulty, question, problem) |
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| APA | Smart Define. (2016). enigma thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/enigma/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "enigma thesaurus" https://smartdefine.org/enigma/thesaurus/synonyms (accessed September 25, 2026). |
| Harvard | Smart Define 2016, enigma thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/enigma/thesaurus/synonyms>. |
| MLA | Smart Define. "enigma thesaurus" 1 April 2016. Web. 25 September 2026. <https://smartdefine.org/enigma/thesaurus/synonyms> |