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known(inscrutableness, rebus)
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APASmart Define. (2011). tough nut to crack thesaurus. Retrieved October 1, 2026, from https://smartdefine.org/tough_nut_to_crack/thesaurus/antonyms
ChicagoSmart Define. 2011. "tough nut to crack thesaurus" https://smartdefine.org/tough_nut_to_crack/thesaurus/antonyms (accessed October 1, 2026).
HarvardSmart Define 2011, tough nut to crack thesaurus, Smart Define, viewed 1 October, 2026, <https://smartdefine.org/tough_nut_to_crack/thesaurus/antonyms>.
MLASmart Define. "tough nut to crack thesaurus" 23 May 2011. Web. 1 October 2026. <https://smartdefine.org/tough_nut_to_crack/thesaurus/antonyms>