extreme 极端的；偏激的；过分的
His business strategy is extreme.
他的这个商业战略很偏激。

gung-ho 疯狂
Don't be so gung-ho about it!
别这么！

rabid 激烈的；极端的
the rabid tabloid 偏激的小报
rabid speculation 非理性推断
Before they knew all the facts, the news reported with rabid speculation on what had happened.
在他们了解所有事实之前，新闻就以疯狂的猜测报道了发生的事情。

sb is （a little） off. 某人的行为，观点等有一些反常。
She is a bit off today.
她今天有一点反常。

off your rocker 疯狂的
She is really off her rocker these days.
她最近真的有些疯, 有点不太对头。