insanity

n. 疯狂, 愚顽, 精神错乱
【医】 精神病

名词复数:insanities 

in.san.i.ty

n.（名词）
【复数】 in.san.i.ties
Persistent mental disorder or derangement.
精神病：持续的精神紊乱或错乱
Law
【法律】
Unsoundness of mind sufficient in the judgment of a civil court to render a person unfit to maintain a contractual or other legal relationship or to warrant commitment to a mental health facility.
精神失常：为民事法庭所判定的心智不健全状态，处于此状态下的个人被认为不适于维持合同或其他法律关系或应送交精神健康机构
In most criminal jurisdictions, a degree of mental malfunctioning sufficient to relieve the accused of legal responsibility for the act committed.
精神失常：在大部分刑事审判中，可以解除被告所犯罪行的法律责任的精神失常的程度


Extreme foolishness; folly.
愚蠢：极端的愚蠢；愚蠢
Something that is extremely foolish.
特别愚蠢的事物

<参考词汇><同义词>insanity,lunacy,madness,mania,dementiaThese nouns denote conditions of serious mental disability.
这些名词表示严重精神失常的状况。
Insanity is a grave, often prolonged condition of mental disorderthat prevents a person from being held legally responsible for his or her actions:
Insanity 是一种严重的，通常是延续的精神紊乱的状态，它使某人可不对他或她的行为负法律责任：
例句：
was judged not guilty for reasons of insanity.
由于精神失常而被判无罪。

Lunacy often denotes derangement relieved intermittently by periods of clear-mindedness:
Lunacy 是指伴随着间歇的精神正常的精神错乱：
例句：
tried to jump out of the fortieth-floor window in a moment of utter lunacy.
在突发的精神失常中试图从四楼的窗户跳出去。

Madness, a more general term, often stresses the violent aspect of mental illness:
Madness 是一个更为通用的词，通常强调精神病的狂暴的一面：
例句：
delusions that progressed to a form of madness.
发展成为一种疯狂状态的幻觉。

Mania refers principally to the excited phase of manic-depressive psychosis:
Mania 主要指躁狂抑郁精神病的狂躁的一面：
例句：
prescribed drugs to control the patient`s periods of mania.
开药方来控制病人的躁狂的阶段。

Dementia implies mental deterioration brought on by organic brain disorder:
Dementia 暗指脑组织破坏而引致的精神恶化：
例句：
underwent progressive stages of dementia.
经历了精神失常由轻到重的发展阶段