Translation of "Folly" in Chinese

It's folly to eat so much.

吃那么多很傻。

- You should be ashamed of your folly.
- You should be ashamed of your stupidity.

你應該為你的愚蠢感到羞恥。

I applied my heart to know wisdom, and to know madness and folly. I perceived that this also was a chasing after wind. For in much wisdom is much grief; and he who increases knowledge increases sorrow.

我一心追求智識，也了解了瘋狂與愚蠢。我覺得這就像是追著風跑。智識的背後是傷悲，所以追求智識之人也多了幾分悲傷。