'Stubborn' in the Bible

But they did not obey Me or bend their ear [to hear Me], but followed the counsels and the stubbornness of their [own] evil heart (mind), and [they turned and] went backward instead of forward.

“Is not My word like fire [that consumes all that cannot endure the test]?” says the Lord, “and like a hammer that breaks the [most stubborn] rock [in pieces]?