Synonyms|96Antonyms|1|Broader|0Narrower|0Related|0

39 entries under secret topic. ×

2
closed book(expression, difficulty, question, puzzle)
2
cryptogram(difficulty, question, puzzle, knot)
2
enigma(noun, difficulty, question, problem)
2
mystification(question, puzzle, obscurity, knot)
2
perplexity(noun, difficulty, question, puzzle)
2
problem(difficulty, question, puzzle, knot)
2
puzzlement(question, puzzle, obscurity, knot)
2
sixty-four-thousand-dollar question(expression, difficulty, question, puzzle)
2
sphinx(difficulty, question, puzzle, knot)
2
stickler(difficulty, question, puzzle, knot)
2
stumper(difficulty, question, puzzle, knot)
2
teaser(difficulty, question, puzzle, knot)
2
twister(difficulty, question, puzzle, knot)
1
abstruseness(difficulty, question, puzzle, perplexity)
1
brainteaser(difficulty, question, puzzle, perplexity)
1
braintwister(difficulty, question, puzzle, perplexity)
1
charade(difficulty, question, puzzle, obscurity)
1
chiller(difficulty, question, puzzle, obscurity)
1
cliffhanger(difficulty, question, puzzle, knot)
1
crux(difficulty, question, puzzle, knot)
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APASmart Define. (2011). tough nut to crack thesaurus. Retrieved October 1, 2026, from https://smartdefine.org/tough_nut_to_crack/thesaurus/synonyms
ChicagoSmart Define. 2011. "tough nut to crack thesaurus" https://smartdefine.org/tough_nut_to_crack/thesaurus/synonyms (accessed October 1, 2026).
HarvardSmart Define 2011, tough nut to crack thesaurus, Smart Define, viewed 1 October, 2026, <https://smartdefine.org/tough_nut_to_crack/thesaurus/synonyms>.
MLASmart Define. "tough nut to crack thesaurus" 23 May 2011. Web. 1 October 2026. <https://smartdefine.org/tough_nut_to_crack/thesaurus/synonyms>