Synonyms|44Antonyms|0|Broader|0Narrower|0Related|0
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crucial question(noun, question)
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million-dollar question(noun, question)
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puzzler(difficulty, question, puzzle, mystery, conundrum)
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vexed question
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APASmart Define. (2011). sixty-four-thousand-dollar question thesaurus. Retrieved September 30, 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 30, 2026).
HarvardSmart Define 2011, sixty-four-thousand-dollar question thesaurus, Smart Define, viewed 30 September, 2026, <https://smartdefine.org/sixty-four-thousand-dollar_question/thesaurus/synonyms>.
MLASmart Define. "sixty-four-thousand-dollar question thesaurus" 24 May 2011. Web. 30 September 2026. <https://smartdefine.org/sixty-four-thousand-dollar_question/thesaurus/synonyms>