'Foolishness' in the Bible

So I dedicated myself to learn about wisdom and knowledge, and about insanity and foolishness. And I discovered that this is also like chasing after the wind.

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

I decided to indulge in wine, while still remaining committed to wisdom. I also tried to indulge in foolishness, just enough to determine whether it was good for human beings under heaven given the short time of their lives.

Next I turned to examine wisdom, insanity, and foolishness, because what can a person do who succeeds the king except what has already been accomplished?

I concluded that wisdom is more useful than foolishness, just as light is more useful than darkness.

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:

As dead flies cause the perfumer's ointment to stink, so also does a little foolishness to one's reputation of wisdom and honor.

Foolishness is given great honor, while the prosperous sit in lowly places.

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