insanity
/ɪnˈsænətɪ/noun
mass noun
1- the state of being seriously mentally ill; madness精神错乱, 精神病; 疯狂：
he suffered from bouts of insanity
他患了阵发性精神病
as complement he attempted to plead insanity.他试图以精神不正常作为辩护理由。
1.1
- extreme foolishness or irrationality极其愚蠢; 极不合理：
it might be pure insanity to take this loan
接受这笔贷款可能是不折不扣的愚蠢行为
count noun the insanities of our time.当今的荒唐事。
词源
late 16th cent.: from Latin insanitas, from insanus （see INSANE）.