'Foolishness' in the Bible

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

My wounds stink and are 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 crown of the wise is their riches: but the foolishness of fools is folly.

The tongue of the wise useth knowledge aright: but the mouth of fools poureth out foolishness.

The heart of him that hath understanding seeketh knowledge: but the mouth of fools feedeth on foolishness.

The foolishness of man perverteth his way: and his heart fretteth against the LORD.

Foolishness is bound 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 scorner is an abomination to men.

Though thou shouldest bray a fool in a mortar among wheat with a pestle, yet will not his foolishness depart from him.

I applied mine heart to know, and to search, and to seek out wisdom, and the reason of things, and to know the wickedness of folly, even of foolishness and madness:

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