hard as nails
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Unyielding, callous, unsympathetic, as in Don't ask her for a contribution—she's hard as nails. This expression has replaced the 14th-century simile hard as flint stone and presumably alludes to the rigidity of nails.
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Words nearby hard as nails
harbour seal, hard, hard act to follow, hard-and-fast, hardanger, hard as nails, hard-ass, hard-asset, hardback, hardbake, hardball
The American Heritage® Idioms Dictionary
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