'Foolish' in the Bible

"For my people are foolish, they don't know me. They are foolish children, and they have no understanding. They are skillful in doing evil, but to do good they have no knowledge."

Then I said, "Surely these are poor. They are foolish; for they don't know the way of Yahweh, nor the law of their God.

'Hear now this, foolish people, and without understanding; who have eyes, and don't see; who have ears, and don't hear:

But they are together brutish and foolish: the instruction of idols! it is but a stock.