'Hardness' in the Bible

Afterwards as they lay at table he was manifested to the eleven, and reproached them with their unbelief and hardness of heart, because they had not believed those who had seen him risen.

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

being darkened in understanding, estranged from the life of God by reason of the ignorance which is in them, by reason of the hardness of their hearts,