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hardboiled(adjective, shrewd, astute, immovable)
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APASmart Define. (1970). tough-nut thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/tough-nut/thesaurus/synonyms
ChicagoSmart Define. 1970. "tough-nut thesaurus" https://smartdefine.org/tough-nut/thesaurus/synonyms (accessed September 29, 2026).
HarvardSmart Define 1970, tough-nut thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/tough-nut/thesaurus/synonyms>.
MLASmart Define. "tough-nut thesaurus" 1 January 1970. Web. 29 September 2026. <https://smartdefine.org/tough-nut/thesaurus/synonyms>