Noun sklērotēs (hardness) in the Bible

(Translation from NRSV for the New Testament and Brenton for the Septuagint with a few modifications for a more litteral meaning)

Romans

2: 5But by the hardness (sklērotēs) and impenitence of your heart you are storing up wrath for yourself on the day of wrath, when God's righteous judgment will be revealed.

Deuteronomy (LXX)

9: 27Remember Abraam, and Isaac, and Jacob thy servants, to whom thou swarest by thyself: look not upon the hardness (sklērotēs) of heart of this people, and their impieties, and their sins.

2 Samuel (LXX: 2 Kings)

22: 6the pangs of death surrounded me, the hardness (sklērotēs) of death prevented me.

Isaiah (LXX)

4: 6 And it shall be for a shadow from the heat, and as a shelter and a hiding-place from the hardness (sklērotēs) (of weather) and from rain.
28: 27For the black poppy is not cleansed with hardness (sklērotēs), nor will a waggon-wheel pass over the cumin; but the black poppy is threshed with a rod, and the cumin shall be eaten with bread;