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3 entries under expression topic. ×

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by the book(idiom, strong, hard, tough)
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hard as nails(idiom, strong, hard, tough)
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rock hard(strong, hard, tough)
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APASmart Define. (1970). tough inflexible thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/tough_inflexible/thesaurus/synonyms
ChicagoSmart Define. 1970. "tough inflexible thesaurus" https://smartdefine.org/tough_inflexible/thesaurus/synonyms (accessed September 29, 2026).
HarvardSmart Define 1970, tough inflexible thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/tough_inflexible/thesaurus/synonyms>.
MLASmart Define. "tough inflexible thesaurus" 1 January 1970. Web. 29 September 2026. <https://smartdefine.org/tough_inflexible/thesaurus/synonyms>