maniac

n. lunatic, insane person, madman; person who acts in a crazy or insane manner

adj. insane, affected by mania; acting in an abnormally enthusiastic or excited manner

Maniac may refer to:"Maniac" (song), by Michael Sembello from the 1983 film FlashdanceMANIAC I, an early computerManiac may also be:A person who exhibits the behaviour known as maniaA classification of serial killerStage name of Norwegian musician Sven Erik KristiansenCallsign of the fictional character Todd Marshall from the Wing Commander game seriesSee also: Maniac (film)
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Maniac is an American slasher film (though considered more of a splatter film), about a disturbed and traumatized serial killer who scalps his victims. It was directed by William Lustig, and co-written by Joe Spinell (who also developed the story and starred as the lead character) and C.A. Rosenberg.
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Noun
1. an insane person
(synonym) lunatic, madman
(hypernym) sick person, diseased person, sufferer
(hyponym) crazy, loony, looney, weirdo
Adjective
1. wildly disordered; "a maniacal frenzy"
(synonym) maniacal, maniac(p)
(similar) insane

(n.)
A raving lunatic; a madman.
  

(a.)
Raving with madness; raging with disordered intellect; affected with mania; mad.
  

Shop mechanic. (ATA1)