'Foolishness' in the Bible

David was told, “Ahithophel [your counselor] is among the conspirators with Absalom.” David said, “O Lord, I pray You, turn Ahithophel’s counsel into foolishness.”

My wounds are loathsome and foulBecause of my foolishness.

The crown of the wise is their wealth [of wisdom],But the foolishness of [closed-minded] fools is [nothing but] folly.

The foolishness of man undermines his way [ruining whatever he undertakes];Then his heart is resentful and rages against the Lord [for, being a fool, he blames the Lord instead of himself].

Foolishness is bound up in the heart of a child;The rod of discipline [correction administered with godly wisdom and lovingkindness] will remove it far from him.

The devising of folly is sin,And the scoffer is repulsive to men.

Even though you pound a [hardened, arrogant] fool [who rejects wisdom] in a mortar with a pestle like grain,Yet his foolishness will not leave him.

I turned around and directed my heart to know, to investigate and to seek [skillful and godly] wisdom and the reason for things, and to know that wickedness is folly and that foolishness is madness [leading to stupidity and recklessness].

the beginning of his talking is foolishness and the end of his talk is wicked madness.

Frustrating the signs and confounding the omens of boasters (false prophets),Making fools out of fortune-tellers,Counteracting the wiseAnd making their knowledge ridiculous,