'Unwise' in the Bible

Do ye thus requite the LORD, O foolish people and unwise? is not he thy father that hath bought thee? hath he not made thee, and established thee?

The sorrows of a travailing woman shall come upon him: he is an unwise son; for he should not stay long in the place of the breaking forth of children.

I am debtor both to the Greeks, and to the Barbarians; both to the wise, and to the unwise.

Wherefore be ye not unwise, but understanding what the will of the Lord is.