insane

形容词 insane:

1. afflicted with or characteristic of mental derangement
2. very foolish
   同义词：harebrained, mad

1. They believed him to be insane.
   他们认为他疯了。
2. Are you insane?
   你疯了吗？
3. Mentally ill; insane.
   疯狂的精神病的; 狂乱的
4. That person is insane.
   那人精神错乱。
5. I have an insane desire to finish that thing.
   我疯狂地渴望去完成那件事。

in.sane

adj.（形容词）

Of, exhibiting, or afflicted with insanity.
精神病的：精神错乱的，显示出或受精神病折磨的
Characteristic of or associated with persons afflicted with insanity:
精神病患者的：为精神病患者所特有的或与之相关联的：
例句：
an insane laugh; insane babbling.
疯笑；疯言乱语

Intended for use by such persons:
用于此类人的：
例句：
an insane asylum.
疯人院

Immoderate; wild:
疯狂的：过度的；狂暴的：
例句：
insane jealousy.
疯狂的妒忌

Very foolish; absurd:
蠢极的：非常愚蠢的；荒唐的：
例句：
took insane risks behind the wheel.
在车辆后面极蠢地冒险

来源：
Latin ons3nus
拉丁语 ons3nus
in- [not] * see in-
in- [不] *参见 in-
s3nus [sane, healthy]
s3nus [正常的，健康的]

【引伸】
insane.ly
adv.（副词）
insane.ness
n.（名词）