Its also important to note that the dictionary uses colloquial definitions and isn't a great place to look for complex ideas. The legal definition, which is the only real professional setting where you'll use the word "insane", defines it as
Quote:
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. Insanity is distinguished from low intelligence or mental deficiency due to age or injury.
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http://dictionary.law.com/Default.as...=979&bold=||||
In which again, most people mentioned in this thread would be deemed perfectly sane.