insane
adj. 疯癫的，精神失常的；蠢极的，荒唐的
例句
He was insane when he carried out the grisly murders.
他在进行那些恐怖的谋杀时已精神错乱。
《柯林斯英汉双解大词典》
My yearning to be rich was an insane, unwholesome desire.
我对致富的渴望疯狂且不正常。
Doctors certified him as insane.
医生证明他精神失常。
《牛津词典》
