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conundrum(noun, question, puzzle, riddle)
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APASmart Define. (2015). difficult problem thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/difficult_problem/thesaurus/narrower
ChicagoSmart Define. 2015. "difficult problem thesaurus" https://smartdefine.org/difficult_problem/thesaurus/narrower (accessed September 20, 2026).
HarvardSmart Define 2015, difficult problem thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/difficult_problem/thesaurus/narrower>.
MLASmart Define. "difficult problem thesaurus" 10 April 2015. Web. 20 September 2026. <https://smartdefine.org/difficult_problem/thesaurus/narrower>