These are all informal words that describe sb who has a mind that does not work normally. 以上各词均为非正式用语，指人神经错乱、精神失常。

• mad (informal, especially BrE) having a mind that does not work normally 指疯的、神经错乱的、有精神病的：◆I thought I'd go mad if I stayed any longer. 我觉得再待久一点我就会发疯。 NOTE Mad is an informal word used to suggest that sb's behaviour is very strange, often because of extreme emotional pressure. It is offensive if used to describe sb suffering from a real mental illness; use mentally ill instead. Mad is not usually used in this meaning in North American English; use crazy instead. * mad 为非正式用语，暗指由于极度的精神压力而行为怪异，用于真正的精神病患者意含冒犯，故用 mentally ill 代之。在美式英语中，通常不用 mad 表示此义，而用 crazy。
• crazy (informal) having a mind that does not work normally 指疯的、神经错乱的、有精神病的：◆A crazy old woman rented the upstairs room. 一个疯老太婆租了楼上那个房间。 NOTE Like mad, crazy is offensive if used to describe sb suffering from a real mental illness. 与 mad 一样，crazy 用于真正的精神病患者具冒犯意。
• nuts [not before noun] (informal) mad 指发疯、神经错乱：◆That noise is driving me nuts! 那噪音吵得我要疯了！◆You guys are nuts! 你们这些家伙全疯了！
• batty (informal, especially BrE) slightly mad, in a harmless way 指疯疯癫癫的、古怪的：◆Her mum's completely batty. 她妈妈完全是疯疯癫癫的。
• out of your mind (informal) unable to think or behave normally, especially because of extreme shock or anxiety 尤指因极度震惊或焦虑而心智失常、发疯：◆She was out of her mind with grief. 她悲痛得精神失常了。
• (not) in your right mind (informal) (not) mentally normal 指精神（不）正常：◆ No one in their right mind would choose to work there. 任何一个精神正常的人都不会选择去那里工作。

Patterns

• to be mad/crazy/nuts/out of your mind/not in your right mind to do sth
• to go mad/crazy/nuts/batty
• to drive sb mad/crazy/nuts/batty/out of their mind
• completely mad/crazy/nuts/batty/out of your mind