'Hard hearted' in the Bible

But because some of the people were hard-hearted and would not give hearing, saying evil words about the Way before the people, he went away from them, and kept the disciples separate, reasoning every day in the school of Tyrannus.

They say that they have knowledge of God, while by their acts they are turning their backs on him; they are hated by all, hard-hearted, and judged to be without value for any good work.