Hard as nails synonyms

What is another word for Hard as nails?

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Synonyms for hard as nails
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Synonyms for Hard as nails. (2016). Retrieved 2026, July 20, from https://thesaurus.plus/synonyms/hard_as_nails
Synonyms for Hard as nails. N.p., 2016. Web. 20 Jul. 2026. <https://thesaurus.plus/synonyms/hard_as_nails>.
Synonyms for Hard as nails. 2016. Accessed July 20, 2026. https://thesaurus.plus/synonyms/hard_as_nails.