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Definition of Lunatic
1. Noun. An insane person.
Exact synonyms: Madman, Maniac
Specialized synonyms: Crazy, Looney, Loony, Nutcase, Weirdo, Bedlamite, Pyromaniac, Madwoman
Generic synonyms: Diseased Person, Sick Person, Sufferer
Derivative terms: Maniacal
Specialized synonyms: Crazy, Looney, Loony, Nutcase, Weirdo, Bedlamite, Pyromaniac, Madwoman
Generic synonyms: Diseased Person, Sick Person, Sufferer
Derivative terms: Maniacal
2. Adjective. Insane and believed to be affected by the phases of the moon.
Exact synonyms: Moonstruck
Language type: Colloquialism
Similar to: Insane
Derivative terms: Lunacy, Lunacy
Language type: Colloquialism
Similar to: Insane
Derivative terms: Lunacy, Lunacy
3. Noun. A reckless impetuous irresponsible person.
Exact synonyms: Daredevil, Harum-scarum, Hothead, Madcap, Swashbuckler
Generic synonyms: Adventurer, Venturer
Specialized synonyms: Tearaway
Derivative terms: Daredevil, Harum-scarum
Generic synonyms: Adventurer, Venturer
Specialized synonyms: Tearaway
Derivative terms: Daredevil, Harum-scarum
Definition of Lunatic
1. a. Affected by lunacy; insane; mad.
2. n. A person affected by lunacy; an insane person, esp. one who has lucid intervals; a madman; a person of unsound mind.
Definition of Lunatic
1. an insane person [n -S]
Medical Definition of Lunatic
1. An obsolete term for a mentally ill person. Origin: see lunacy (05 Mar 2000)