Longman Dictionary of Contemporary English homepage

insane

adjective
     
in‧sane
1 informal completely stupid or crazy, often in a way that is dangerous:
That's an insane risk.
The whole idea sounds absolutely insane to me.
Why did you do that? Have you gone insane?
2MI someone who is insane is permanently and seriously mentally ill so that they cannot live in normal society:
The killer was declared criminally insane.
3

the insane

people who are mentally ill:
a hospital for the insane
4

drive somebody insane

informal to make someone feel more and more annoyed or angry, usually over a long period of time [= drive somebody mad]:
My little brother's been driving me insane all weekend.
insanely adverb:
insanely jealous
She giggled insanely.

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