1 having a mind that does not work normally; mentally ill 疯癫的;精神失常的
It is not usual nowadays to use mad or insane to describe a person who is not mentally normal. We use the expression mentally ill. 形容某人精神有问题,如今通常不用mad或insane,而用mentally ill。
2 (Brit 英) not at all sensible; crazy 傻的;愚蠢的;荒唐的:
You must be mad to drive in this weather.你在这种天气里驾车简直是发疯了。
3 (not before a noun 不用于名词前) mad (at/with sb) (about sth) very angry 极为愤怒;十分恼火:
His laziness drives me mad!他这样懒惰,真把我气死了! (especially US 尤为美)Don't get/go mad at him. He didn't mean to do it.不要恼他,他不是有心这样做的。
4 (informal 非正式)mad about/on sb/sth liking sb/sth very much 非常喜欢;对…着迷:
He's mad on computer games at the moment.他此刻正沉迷于计算机游戏。Steve's mad about Jane.史蒂夫迷恋着简。
5 not controlled; wild or very excited 不受控制的;狂乱的;十分兴奋的:
The audience was cheering and clapping like mad (= very hard).观众疯狂地欢呼鼓掌。When DiCaprio appeared on the hotel balcony his fans went mad.当狄卡普里欧出现在酒店阳台上的时候,他的影迷们简直疯了。