'Folly' in the Bible

I applied my heart to know wisdom, and to know madness and folly. I perceived that this also was a chasing after wind.

I searched in my heart how to cheer my flesh with wine, my heart yet guiding me with wisdom, and how to lay hold of folly, until I might see what it was good for the sons of men that they should do under heaven all the days of their lives.

I turned myself to consider wisdom, madness, and folly: for what can the king's successor do? Just that which has been done long ago.

Then I saw that wisdom excels folly, as far as light excels darkness.

Dead flies cause the oil of the perfumer to send forth an evil odor; so does a little folly outweigh wisdom and honor.

Folly is set in great dignity, and the rich sit in a low place.