- Definitions|1
- Thesaurus|74
- Abbreviations|0
19 entries under noun topic. ×
| enigma(trouble, challenge, question, secret) | |
| mystery(trouble, difficulty, challenge, question) | |
| riddle(trouble, challenge, question, secret) | |
| conundrum(trouble, challenge, question, secret) | |
| secret(trouble, challenge, question, puzzle) | |
| brain-teaser(trouble, challenge, puzzle, mystery) | |
| mystification(trouble, challenge, question, secret) | |
| problem(trouble, challenge, question, secret) | |
| puzzlement(trouble, challenge, question, secret) | |
| poser(trouble, challenge, question, secret) | |
| puzzle(trouble, challenge, question, secret) | |
| whodunit(question, secret, puzzle, subtlety) | |
| why(trouble, difficulty, challenge, question) | |
| arcanum | |
| mystery story | |
| crux(trouble, difficulty, challenge, question) | |
| dilemma(trouble, challenge, puzzle) | |
| head-scratcher(trouble, challenge, brainteaser) | |
| perplexity(difficulty, question, secret, puzzle) |
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| APA | Smart Define. (2016). closed book thesaurus. Retrieved September 28, 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 28, 2026). |
| Harvard | Smart Define 2016, closed book thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/closed_book/thesaurus/synonyms>. |
| MLA | Smart Define. "closed book thesaurus" 31 March 2016. Web. 28 September 2026. <https://smartdefine.org/closed_book/thesaurus/synonyms> |