doolally
adj. 疯狂的,神经错乱的;异常激动的,欣喜若狂的
例句
The poor chap's gone doolally.
这可怜的小伙子疯了。
《牛津词典》
How can that handsome guy fall in love with that old woman? He must have gone doolally.
那个帅哥怎么会喜欢上那个老女人?他肯定脑子出问题了。