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2 entries under expression topic. ×

1
closed book(question, secret, puzzle, subtlety)
1
tough nut to crack(idiom, difficulty, question, secret)
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APASmart Define. (2011). sixty-four-thousand-dollar question thesaurus. Retrieved September 29, 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 29, 2026).
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MLASmart Define. "sixty-four-thousand-dollar question thesaurus" 24 May 2011. Web. 29 September 2026. <https://smartdefine.org/sixty-four-thousand-dollar_question/thesaurus/synonyms>