'Foolishness' in the Bible

And one told David saying, Ahithophel is among the conspirators with Absalom. Then said David, Jehovah, I pray thee, turn the counsel of Ahithophel into foolishness.

My wounds stink, they are corrupt, because of my foolishness.

Thou, O God, knowest my foolishness, and my trespasses are not hidden from thee.

I turned, I and my heart, to know, and to search, and to seek out wisdom and reason, and to know wickedness to be folly, and foolishness to be madness;