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challenge(noun, thinking, brain)
10 years ago|164 views|share |citing 
APASmart Define. (2016). conundrum thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/conundrum/thesaurus/broader
ChicagoSmart Define. 2016. "conundrum thesaurus" https://smartdefine.org/conundrum/thesaurus/broader (accessed September 22, 2026).
HarvardSmart Define 2016, conundrum thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/conundrum/thesaurus/broader>.
MLASmart Define. "conundrum thesaurus" 1 April 2016. Web. 22 September 2026. <https://smartdefine.org/conundrum/thesaurus/broader>