Noun: An individual who is incapable of acting rationally due to
mental illness, usually accompanied by
overt bizarre behavior. Usually used humorously or informally.
Adj: Behavior that is manifestly irrational and disturbing to others
The action of the United States Congress in voting
to pass a bill that would strike this word Lunatic from the U.S. Code.
They do not provide a replacement for this term, therefore if there are existing laws that protect those who do not have the ego or cognitive ability to care for themselves, any governmental protection will be removed.
The reason given is that the word has an archaic root, which would include
eliminating a fairly large part of the English vocabulary, it would be
decimated (look that one up