hard as nails

Idioms & Phrases

hard as nails

Unyielding, callous, unsympathetic, as in Don't ask her for a contributionshe's hard as nails. This expression has replaced the 14th-century simile hard as flint stone and presumably alludes to the rigidity of nails.

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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