You must be mad to risk it.

你去冒这种风险，简直是疯了。

《牛津词典》

Mum will be mad if she sees this mess.

如果妈妈看到这一团糟，她会生气的。

youdao

In fact, they were being ridiculous to fight and be mad at each other over nothing.

事实上，他们无缘无故地争吵和生对方的气是很可笑的事情。

youdao

The joy and moral stimulation of work no longer must be forgotten in the mad chase of evanescent profits.

VOA: special.2011.03.17

Mom and dad are going to be very mad at me.

我爸妈会对我大发雷霆的。

I'm sure 实战 - SpeakingMax英语口语达人

So the mad scientist explains all of this to you, but in order to give it a little kicker, because he's also an evil mad scientist-- that may be evil already,but because he's an evil mad scientist-- he says,And then when I'm done-- So over here we've got Shelly's body but Linda's personality.

于是疯狂科学家向你解释这一切，但为了增加一点戏剧性，因为他同时是个邪恶的疯狂科学家-,因为他是既邪恶又疯狂的科学家-,他说，当我完成之后…,这是Shelly的肉体和Linda的人格。

耶鲁公开课 - 死亡课程节选

Many think it would be mad to imperil this proven source of economic growth.

ECONOMIST: Student visas

"I would be mad not to take that fight and knock him out, " said Haye.

BBC: SPORT | Boxing | Haye powers to win as heavyweight

Britain, for instance, would be mad to turn its back on financial services (see article).

ECONOMIST: Debt reduction