'Folly' in the Bible

So {I dedicated myself} to learn about wisdom and [to] learn about delusion and folly. However, I discovered that this also [is] chasing wind.

I said of laughter, "[It is] folly!" and of pleasure, "{What does it accomplish?}"

I also {explored} {the effects of indulging my flesh} with wine. My mind guiding me with wisdom, {I investigated} folly so that I might discover what [is] good under heaven for {humans} to do {during the days of their lives}.

Next, I considered wisdom, as well as delusion and folly. What can anyone [do] who will come after the king that has not already been done?

I realized that wisdom has an advantage over folly, just as light has an advantage over darkness.

I set my mind to try to seek wisdom and the plan, and to know that wickedness [is] foolishness and that folly [is] delusion.

Dead flies cause a bad smell [and] ruin the ointment of the perfumer. So also a little folly outweighs wisdom and honor.