Lunatic - Wikipedia Lunatic is a term referring to a person who is seen as mentally ill, dangerous, foolish, [1][2] or crazy —conditions once attributed to "lunacy" The word derives from lunaticus meaning "of the moon" or "moonstruck" [3][4][5]
LUNATIC Definition Meaning | Dictionary. com Lunatic definition: (no longer in technical use; now considered offensive) an insane person See examples of LUNATIC used in a sentence