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38 entries under secret topic. ×

2
brainteaser(difficulty, question, puzzle, subtlety)
1
closed book(expression, question, puzzle, subtlety)
1
tough nut to crack(expression, idiom, difficulty, question)
1
braintwister(difficulty, question, puzzle, subtlety)
1
charade(difficulty, question, puzzle, subtlety)
1
chiller(difficulty, question, puzzle, subtlety)
1
cliffhanger(difficulty, question, puzzle, obscurity)
1
crux(difficulty, question, puzzle, obscurity)
1
cryptogram(difficulty, question, puzzle, obscurity)
1
difficulty(question, puzzle, obscurity, subtlety)
1
grabber(difficulty, question, puzzle, obscurity)
1
inscrutability(difficulty, question, puzzle, subtlety)
1
inscrutableness(difficulty, question, puzzle, subtlety)
1
mindboggler(difficulty, question, puzzle, subtlety)
1
mystery(noun, difficulty, question, puzzle)
1
mystification(question, puzzle, obscurity, subtlety)
1
occult(difficulty, question, puzzle, subtlety)
1
oracle(difficulty, question, puzzle, subtlety)
1
perplexity(noun, difficulty, question, puzzle)
1
poser(difficulty, question, puzzle, subtlety)
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APASmart Define. (2011). sixty-four-thousand-dollar question thesaurus. Retrieved October 1, 2026, from https://smartdefine.org/sixty-four-thousand-dollar_question/thesaurus/synonyms
ChicagoSmart Define. 2011. "sixty-four-thousand-dollar question thesaurus" https://smartdefine.org/sixty-four-thousand-dollar_question/thesaurus/synonyms (accessed October 1, 2026).
HarvardSmart Define 2011, sixty-four-thousand-dollar question thesaurus, Smart Define, viewed 1 October, 2026, <https://smartdefine.org/sixty-four-thousand-dollar_question/thesaurus/synonyms>.
MLASmart Define. "sixty-four-thousand-dollar question thesaurus" 24 May 2011. Web. 1 October 2026. <https://smartdefine.org/sixty-four-thousand-dollar_question/thesaurus/synonyms>