American Idioms – Idiom Wizard Lists Over 5,500 Idioms & Slang Descriptions

Hard as nails


Stern personality. Resilient character traits. Typically used about someone who is unbending in their moral or business practices. Refers to metal construction nails, not finger nails. The phrase suggests a difficult person to handle, much like a drill sergeant in the military. (Compare to My way or the highway.)

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