insane
//ɪnˈseɪn//
Adjective
insaneCanonical form
more insaneComparative
most insaneSuperlative
1
Mentally ill; suffering from a serious mental disorder that affects one's ability to think rationally or behave normally.
He was declared legally insane and sent to a psychiatric hospital.
2
Extremely foolish, irrational, or unreasonable; lacking common sense.
It's insane to drive in this weather without snow tires.
3
Extremely excessive or extreme in degree; outrageous.
The prices at that restaurant are insane.