Synonyms|95Antonyms|1|Broader|0Narrower|0Related|7

4 entries under expression topic. ×

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by the book(adjective, idiom, strong, hard)
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hard as nails(adjective, idiom, strong, hard)
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rock hard(adjective, strong, hard, tough)
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tough inflexible(adjective, strong, hard, tough)
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APASmart Define. (2015). ferrous thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/ferrous/thesaurus/synonyms
ChicagoSmart Define. 2015. "ferrous thesaurus" https://smartdefine.org/ferrous/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, ferrous thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/ferrous/thesaurus/synonyms>.
MLASmart Define. "ferrous thesaurus" 13 April 2015. Web. 22 September 2026. <https://smartdefine.org/ferrous/thesaurus/synonyms>