'Hardness' in the Bible

And looking around at them with anger, grieved at the hardness of their hearts, he said to the man, "Stretch out your hand." And he stretched [it] out, and his hand was restored.

But Jesus said to them, "He wrote this commandment for you because of your hardness of heart.

And later, [while] they were reclining at table, he appeared to the eleven. And he reprimanded their unbelief and hardness of heart, because they did not believe those who had seen him [after he] had been raised.