- Definitions|1
- Thesaurus|74
- Abbreviations|0
40 entries under secret topic. ×
| cryptogram(difficulty, question, puzzle, obscurity) | |
| difficulty(question, puzzle, obscurity, subtlety) | |
| grabber(difficulty, question, puzzle, perplexity) | |
| inscrutability(difficulty, question, puzzle, subtlety) | |
| inscrutableness(difficulty, question, puzzle, subtlety) | |
| mindboggler(difficulty, question, puzzle, subtlety) | |
| occult(difficulty, question, puzzle, subtlety) | |
| oracle(difficulty, question, puzzle, subtlety) | |
| perplexity(noun, difficulty, question, puzzle) | |
| question(difficulty, puzzle, obscurity, subtlety) | |
| rebus(question, puzzle, subtlety, mystery) | |
| rune(difficulty, question, puzzle, subtlety) | |
| secrecy(difficulty, question, puzzle, obscurity) | |
| sphinx(difficulty, question, puzzle, perplexity) | |
| stickler(difficulty, question, puzzle, obscurity) | |
| stumper(difficulty, question, puzzle, perplexity) | |
| subtlety(difficulty, question, puzzle, obscurity) | |
| teaser(difficulty, question, puzzle, perplexity) | |
| thriller(difficulty, question, puzzle, subtlety) | |
| twister(difficulty, question, puzzle, obscurity) |
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| APA | Smart Define. (2016). closed book thesaurus. Retrieved September 29, 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 29, 2026). |
| Harvard | Smart Define 2016, closed book thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/closed_book/thesaurus/synonyms>. |
| MLA | Smart Define. "closed book thesaurus" 31 March 2016. Web. 29 September 2026. <https://smartdefine.org/closed_book/thesaurus/synonyms> |