- Definitions|1
- Thesaurus|74
- Abbreviations|0
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| conundrum(noun, trouble, challenge, question, secret) |
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| APA | Smart Define. (2016). closed book thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/closed_book/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "closed book thesaurus" https://smartdefine.org/closed_book/thesaurus/synonyms (accessed September 26, 2026). |
| Harvard | Smart Define 2016, closed book thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/closed_book/thesaurus/synonyms>. |
| MLA | Smart Define. "closed book thesaurus" 31 March 2016. Web. 26 September 2026. <https://smartdefine.org/closed_book/thesaurus/synonyms> |