'Foolishness' in the Bible

Someone told David, saying, "Ahithophel is among the conspirators with Absalom." David said, "Yahweh, please turn the counsel of Ahithophel into foolishness."

My wounds are loathsome and corrupt, because of my foolishness.

God, you know my foolishness. My sins aren't hidden from you.

A prudent man keeps his knowledge, but the hearts of fools proclaim foolishness.

The foolishness of man subverts his way; his heart rages against Yahweh.

Though you grind a fool in a mortar with a pestle along with grain, yet his foolishness will not be removed from him.

I said of laughter, "It is foolishness;" and of mirth, "What does it accomplish?"

I turned around, and my heart sought to know and to search out, and to seek wisdom and the scheme of things, and to know that wickedness is stupidity, and that foolishness is madness.

The beginning of the words of his mouth is foolishness; and the end of his talk is mischievous madness.