'Hardness' in the Bible

And having looked round upon them with anger, being grieved for the hardness of their heart, he saith to the man, 'Stretch forth thy hand;' and he stretched forth, and his hand was restored whole as the other;

but, according to thy hardness and impenitent heart, thou dost treasure up to thyself wrath, in a day of wrath and of the revelation of the righteous judgment of God,

For I do not wish you to be ignorant, brethren, of this secret -- that ye may not be wise in your own conceits -- that hardness in part to Israel hath happened till the fulness of the nations may come in;

being darkened in the understanding, being alienated from the life of God, because of the ignorance that is in them, because of the hardness of their heart,