stupid and unreasonable behaviour, speech, situations, etc.

A moment's craziness had lost him his wife and his job. 片刻的疯狂让他既失去了太太又没了工作。

The public wants to stop the craziness of letting people who are criminals get guns. 公众希望停止让犯罪分子获得枪支的疯狂行为。

an offensive word for mental illness, or for behaviour that is considered typical of someone with a mental illness