1 seriously mentally ill and unable to live in normal society:
Doctors certified him as insane. * The prisoners were slowly going insane.
OPPSANE
2 (the insane) noun [pl.] people who are insane:
a hospital for the insane
3 (informal) very stupid, crazy or dangerous:
I must have been insane to agree to the idea.
seealsoINSANITY
insanely adverb:
He is insanely jealous.
IDIOMS see DRIVEv.
