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hard as nails

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*hard as nails

Cliché [of someone] stern and unyielding. (*Also: as ∼.) Don't try to bargain with Liz. She's as hard as nails. Bob may seem sweet and easily swayed, but in fact he's hard as nails.

See also: hard, nail

hard as nails

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.

See also: hard, nail