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inedible
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APASmart Define. (1970). tough as old boots thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/tough_as_old_boots/thesaurus/synonyms
ChicagoSmart Define. 1970. "tough as old boots thesaurus" https://smartdefine.org/tough_as_old_boots/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 1970, tough as old boots thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/tough_as_old_boots/thesaurus/synonyms>.
MLASmart Define. "tough as old boots thesaurus" 1 January 1970. Web. 24 September 2026. <https://smartdefine.org/tough_as_old_boots/thesaurus/synonyms>