here's the definition of insanity the state of being seriously mentally ill; madness. "he suffered from bouts of insanity" synonyms: mental illness, madness, dementia; More

Insanity. n. mental illness of such a severe nature that a person cannot distinguish fantasy from reality, cannot conduct her/his affairs due to psychosis, or is subject to uncontrollable impulsive behavior.

" there's nothing funny about being insane. Being mentally ill to the point of being classed insane is quite literally the opposite of funny, and is one of the scariest, most horrible ailments I can think of. Your pathetic, desperate attempt to be quirky and misuse of the term makes me want to poison myself" - Alex from I Hate Everything