harden someone's heart

Verb

 * 1)  To make someone more resistant to something.
 * Seeing so much suffering for so long hardened his heart.
 * She hardened her heart against his inevitable pleas.
 * 1) * 1611, Authorized King James translation of Exodus 7:3–4:
 * And I will harden Pharaoh's heart, and multiply my signs and my wonders in the land of Egypt. But Pharaoh shall not hearken unto you, that I may lay my hand upon Egypt, and bring forth mine armies, and my people the children of Israel, out of the land of Egypt by great judgments.

Translations

 * Japanese: