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Meaning of lunatic. Lunatic A reckless or psychopathic individual. The definition of a lunatic is a person who is either actually crazy or who is acting crazy and wild in his behavior. A mentally deranged person.

General Comment Lunatic Fringe is an old political slang expression for what today we would call militant wingnut activist groups. A person who is affected by lunacy. The term lunaticus est is the Latin translation of the Greek verb σεληνιαζεται seleniazetai which includes the prefix selen - from σεληνη - the ancient Greek word for the moon.

Therefore the original meaning of the term lunatic seems to be linked to epilepsy rather than insanity. Nutter British slang nut slang maniac loony slang More Synonyms of lunatic. Definition of lunatic.

Luːnətɪk Word forms. A person who behaves in a really wild and bizarre manner is an example of a lunatic. Designed for the care of mentally ill people a lunatic asylum.

Derived from Lunar which in turn is derived from the Latin word for Moon. Now considered offensive an insane person. Countable noun If you describe someone as a lunatic you think they behave in a dangerous stupid or annoying way.

Affected with periodic insanity dependent on the changes of the moon from Old French lunatique See definitions of lunatic. If you describe someone as a lunatic you think they behave in a dangerous stupid or annoying way. A crazy person is an example of a lunatic.