[mass noun]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。 ■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。
语源
late 16th cent.: from Latin insanitas, from insanus (see insane)