Synonyms of hard as nails in English:

hard as nails


See definition of (as) hard as nails

phrase

1

SYNONYMS
callous, hard-hearted, heartless, with a heart of stone, stony, stony-hearted, unfeeling, unsympathetic, uncaring, insensitive, unsentimental, cold-hearted, cold, hard-bitten, tough, unforgiving, lacking compassion, uncharitable, inflexible, unbending, implacable
North American informal badass