1) A mental state where one can not tell the difference between reality and their imagination.
3) A type of behaviour where a person may act in a way that may be seen as "uncool" or "weird" (and doesn't care).
3) The only way to fly.
Austin Powers: You're insane!
Goldmember: And that's the way, uh-huh, uh-huh, I like it!
by Peeves April 12, 2004
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The state of suffering a severe psychiatric disease which causes extremely abnormal behaviour or loss of touch with reality (psychosis), most commonly associated with schizophrenia and bipolar illness (the manic phase).
King George suffered from bouts of insanity.
by Doc_B April 13, 2015
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Coming to the realization that it really is all in your head, and that you are the master of your own universe.
What is more real than human perception and cognition? Free, honest pure souls are those we say "suffer" from "insanity"
by synaptic cosmonaut April 24, 2009
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Insanity is doing the exact same fucking thing, over and over again, expecting shit to change.
Example: The Call of Duty franchise is one definition of insanity.
by Station428 September 4, 2017
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insanity is not a disease, it is when you give up. or have lived among people who broke you until you snapped. yes some people are mentally challenged but most people who murder others do it for desire, lust, anger, fear. theses types of feelings get over whelming or even over looked by others.

school shootings are not events that only happen because of mentally challenged people, sometimes the students become the shooters because of how badly they were treated or because they couldn't help but be a little different to other people and nobody wanted to talk to them respectfully. Do not event blame technology either! people go insane because the ass-holes that live on this fucking planet think that they can just punch someone and there would be consequences for their actions!
by please-kill-me-2019 August 28, 2019
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doing something over and over expecting different results
-Albert Einstein
i keep hitting this hamster... but it wont make money, this is insanity!
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