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Definition of Maniac
1. Adjective. Wildly disordered. "A maniacal frenzy"
2. Noun. An insane person.
Exact synonyms: Lunatic, Madman
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
3. Noun. A person who has an obsession with or excessive enthusiasm for something.
Definition of Maniac
1. a. Raving with madness; raging with disordered intellect; affected with mania; mad.
2. n. A raving lunatic; a madman.
Definition of Maniac
1. Noun. An insane person, especially one who suffers from a mania. ¹
2. Noun. A fanatic, a person with an obsession. ¹
¹ Source: wiktionary.com
Definition of Maniac
1. an insane person [n -S] : MANIACAL [adj]
Medical Definition of Maniac
1. 1. Obsolete term for a mentally ill or disturbed person. 2. One suffering from mania. (05 Mar 2000)