Stubborn.

Because I knew that thou art OBSTINATE, and thy neck is an iron sinew, and thy brow brass; I have even from the beginning declared it to thee; before it came to pass I showed it thee: lest thou shouldest say, Mine idol hath done them, and my graven image, and my molten image, hath commanded them. ( Isaiah 48:4-5 )

Dictionary of Words from the King James Bible. Public Domain. Copy freely.