'Foolishness' in the Bible

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

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

O God, thou knowest my foolishness; And my sins are not hid from thee.

A prudent man concealeth knowledge; But the heart of fools proclaimeth foolishness.

The foolishness of man subverteth his way; And his heart fretteth against Jehovah.

Foolishness is bound up in the heart of a child; But the rod of correction shall drive it far from him.

The thought of foolishness is sin; And the scoffer is an abomination to men.

Though thou shouldest bray a fool in a mortar with a pestle along with bruised grain, Yet will not his foolishness depart from him.

I turned about, and my heart was set to know and to search out, and to seek wisdom and the reason of things , and to know that wickedness is folly, and that foolishness is madness.

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