be as hard as nails

to have no feelings or sympathy for other people She'll be good in business - she's as hard as nails.

Name	Pronounced	Usage
Perle	-	French, Yiddish
Juha	YOO-hah	Finnish
Pamella	PAM-ə-lə	English
Anselma	ahn-ZEL-mah (German)	German, Italian, Spanish
Sverrir	-	Ancient Scandinavian, Icelandic
Kimberlyn	KIM-bər-lin	English (Rare)