Answer a fool according to his folly.

按愚人的蠢话回答愚人。

《新英汉大辞典》

He who answers before listening - that is his folly and his shame.

未曾听完先回答的，便是他的愚昧和羞辱。

youdao

Answer a fool according to his folly, or he will be wise in his own eyes.

要照愚昧人的愚妄话回答他，免得他自以为有智慧。

youdao

I wanted him to consider the folly of his decision.

我想让他再考虑下他荒唐的决定。

What if 课堂 - SpeakingMax英语口语达人

Struck by the realization of his folly, he will turn and come speeding back.

NEWYORKER: Amundsen

Mr Aitken's friends acknowledge his folly but resent what they regard as his continued hounding.

ECONOMIST: Jonathan Aitken

He inhabits a vast, restless, awful, and awesome isolation, which is both his folly and his tragedy.

NEWYORKER: Lives in Limbo