51 entries under expression topic. ×
| closed book(noun, idiom, trouble, challenge) | |
| mystery story(noun, idiom, question, secret) | |
| tough nut to crack(noun, question, secret, puzzle) | |
| crossword puzzle(noun, idiom, difficult, issue) | |
| fair question(noun, idiom, question, secret) | |
| bone of contention(noun, idiom, question, secret) | |
| crux criticorum(noun, idiom, secret, brain) | |
| field of inquiry(noun, idiom, question, secret) | |
| knotty point(noun, idiom, question, secret) | |
| matter in dispute(noun, idiom, question, secret) | |
| moot point(noun, idiom, question, secret) | |
| brain twister(noun, idiom, difficult, issue) | |
| vexed question(noun, idiom, trouble, challenge) | |
| diagnus vindice nodus(noun, idiom, problem, secret) | |
| jigsaw puzzle(idiom, secret, mystery, brain-twister) | |
| open question(noun, idiom, question, secret) | |
| plain question(noun, idiom, question, secret) | |
| point in dispute(noun, idiom, question, secret) | |
| question at issue(noun, idiom, question, secret) | |
| sealed book(noun, idiom, problem, secret) |
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| APA | Smart Define. (2016). enigma thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/enigma/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "enigma thesaurus" https://smartdefine.org/enigma/thesaurus/synonyms (accessed September 20, 2026). |
| Harvard | Smart Define 2016, enigma thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/enigma/thesaurus/synonyms>. |
| MLA | Smart Define. "enigma thesaurus" 1 April 2016. Web. 20 September 2026. <https://smartdefine.org/enigma/thesaurus/synonyms> |