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35 entries under difficulty topic. ×

2
brainteaser(question, secret, puzzle, subtlety)
1
tough nut to crack(expression, idiom, question, secret)
1
braintwister(question, secret, puzzle, subtlety)
1
charade(question, secret, puzzle, subtlety)
1
chiller(question, secret, puzzle, subtlety)
1
cliffhanger(question, secret, puzzle, obscurity)
1
crux(question, secret, puzzle, obscurity)
1
cryptogram(question, secret, puzzle, obscurity)
1
grabber(question, secret, puzzle, obscurity)
1
inscrutability(question, secret, puzzle, subtlety)
1
inscrutableness(question, secret, puzzle, subtlety)
1
mindboggler(question, secret, puzzle, subtlety)
1
mystery(noun, question, secret, puzzle)
1
occult(question, secret, puzzle, subtlety)
1
oracle(question, secret, puzzle, subtlety)
1
perplexity(noun, question, secret, puzzle)
1
poser(question, secret, puzzle, subtlety)
1
problem(question, secret, puzzle, obscurity)
1
puzzle(question, secret, obscurity, mystery)
1
question(secret, puzzle, obscurity, subtlety)
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APASmart Define. (2011). sixty-four-thousand-dollar question thesaurus. Retrieved September 28, 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 September 28, 2026).
HarvardSmart Define 2011, sixty-four-thousand-dollar question thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/sixty-four-thousand-dollar_question/thesaurus/synonyms>.
MLASmart Define. "sixty-four-thousand-dollar question thesaurus" 24 May 2011. Web. 28 September 2026. <https://smartdefine.org/sixty-four-thousand-dollar_question/thesaurus/synonyms>