- Definitions|0
- Thesaurus|97
- Abbreviations|0
39 entries under secret topic. ×
| difficulty(question, puzzle, obscurity, subtlety) | |
| grabber(difficulty, question, puzzle, knot) | |
| inscrutability(difficulty, question, puzzle, perplexity) | |
| inscrutableness(difficulty, question, puzzle, perplexity) | |
| mindboggler(difficulty, question, puzzle, perplexity) | |
| mystery(noun, difficulty, question, problem) | |
| occult(difficulty, question, puzzle, perplexity) | |
| oracle(difficulty, question, puzzle, obscurity) | |
| poser(difficulty, question, puzzle, obscurity) | |
| puzzle(difficulty, question, problem, obscurity) | |
| question(difficulty, puzzle, obscurity, knot) | |
| rebus(difficulty, question, puzzle, perplexity) | |
| riddle(noun, difficulty, question, puzzle) | |
| rune(difficulty, question, puzzle, perplexity) | |
| secrecy(difficulty, question, puzzle, obscurity) | |
| subtlety(difficulty, question, puzzle, obscurity) | |
| thriller(difficulty, question, puzzle, perplexity) | |
| whodunit(difficulty, question, puzzle, perplexity) | |
| why(difficulty, question, puzzle, knot) |
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| APA | Smart Define. (2011). tough nut to crack thesaurus. Retrieved October 1, 2026, from https://smartdefine.org/tough_nut_to_crack/thesaurus/synonyms |
| Chicago | Smart Define. 2011. "tough nut to crack thesaurus" https://smartdefine.org/tough_nut_to_crack/thesaurus/synonyms (accessed October 1, 2026). |
| Harvard | Smart Define 2011, tough nut to crack thesaurus, Smart Define, viewed 1 October, 2026, <https://smartdefine.org/tough_nut_to_crack/thesaurus/synonyms>. |
| MLA | Smart Define. "tough nut to crack thesaurus" 23 May 2011. Web. 1 October 2026. <https://smartdefine.org/tough_nut_to_crack/thesaurus/synonyms> |