- Definitions|0
- Thesaurus|97
- Abbreviations|0
27 entries under obscurity topic. ×
| enigma(noun, difficulty, question, problem, secret) | |
| mystification(question, secret, puzzle, knot) | |
| puzzlement(question, secret, puzzle, knot) | |
| sixty-four-thousand-dollar question(expression, difficulty, question, secret, puzzle) | |
| abstruseness(difficulty, question, secret, puzzle, perplexity) | |
| brainteaser(difficulty, question, secret, puzzle, perplexity) | |
| braintwister(difficulty, question, secret, puzzle, perplexity) | |
| charade(difficulty, question, secret, puzzle) | |
| chiller(difficulty, question, secret, puzzle) | |
| difficulty(question, secret, puzzle, subtlety) | |
| inscrutability(difficulty, question, secret, puzzle, perplexity) | |
| inscrutableness(difficulty, question, secret, puzzle, perplexity) | |
| mindboggler(difficulty, question, secret, puzzle, perplexity) | |
| mystery(noun, difficulty, question, problem, secret) | |
| occult(difficulty, question, secret, puzzle, perplexity) | |
| oracle(difficulty, question, secret, puzzle) | |
| poser(difficulty, question, secret, puzzle) | |
| puzzle(difficulty, question, problem, secret) | |
| question(difficulty, secret, puzzle, knot) | |
| rebus(difficulty, question, secret, puzzle, perplexity) |
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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> |