lunatic: Meaning and Definition of

lu•na•tic

1. an insane person.
2. a person whose actions and manner are marked by extreme eccentricity or recklessness.
3. a person legally declared to be of unsound mind and who therefore is not held capable or responsible before the law.

1. insane; demented; crazy.
2. characteristic or suggestive of lunacy; wildly or recklessly foolish.
3. designated for or used by the insane: a lunatic asylum.
4. gaily or lightheartedly mad, frivolous, eccentric, etc.: She has a lunatic charm that is quite engaging.