James Strong - Słownik Języka Greckiego

And when he had looked round about on them with anger, being grieved for the hardness^G4457 of their hearts, he saith unto the man, Stretch forth thine hand. And he stretched it out: and his hand was restored whole as the other.
KJV Mar 3:5

For I would not, brethren, that ye should be ignorant of this mystery, lest ye should be wise in your own conceits; that blindness^G4457 in part is happened to Israel, until the fulness of the Gentiles be come in.
KJV Rzym 11:25

Having the understanding darkened, being alienated from the life of God through the ignorance that is in them, because of the blindness^G4457 of their heart:
KJV Efez 4:18