'Foolishness' in the Bible

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.