hard as nails
Slang definitions & phrases for
hard as nails
hard as nails
adjective phrase
Extremely durable and grim;
tough
(1850s+)
Idioms and Phrases with
hard as nails
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.