Exhibiting unsoundness or disorder of mind; not sane; utterly mad. / Used by or relating to insane people. / Causing insanity or madness.

In an insane manner; not sanely. / To a great degree; very much.

insanity; madness

comparative form of insane: more insane

The state of being insane; madness.

plural of insanity

(rare) The state of being insanable, or impossible to cure.

Not capable of being healed, incurable, irremediable.

(dated) A facility where persons with serious mental disorders are housed.

plural of insane asylum