maniac

from WordNet (r) 3.0 (2006)
maniac
    adj 1: wildly disordered; "a maniacal frenzy" [syn: {maniacal},
           {maniac(p)}]
    n 1: an insane person [syn: {lunatic}, {madman}, {maniac}]
    2: a person who has an obsession with or excessive enthusiasm
       for something
    
from The Collaborative International Dictionary of English v.0.48
Maniac \Ma"ni*ac\, a. [F. maniaque. See {Mania}.]
   Raving with madness; raging with disordered intellect;
   affected with mania; mad.
   [1913 Webster]
    
from The Collaborative International Dictionary of English v.0.48
maniac \ma"ni*ac\, n.
   A raving lunatic; a madman.
   [1913 Webster]
    
from Moby Thesaurus II by Grady Ward, 1.0
51 Moby Thesaurus words for "maniac":
      aliene, batty, bedlamite, berserk, borderline case, crackbrain,
      cracked, crackpot, crazed, crazy, delirious, dement, demented,
      demoniac, deranged, energumen, enthusiast, fan, fanatic, fiend,
      flake, fou, frantic, freak, frenetic, frenzied, furious, idiot,
      kook, loon, loony, lunatic, mad, madman, meshuggenah, non compos,
      noncompos, nut, phrenetic, psychopath, psychotic, rabid, raging,
      ranting, raving lunatic, screwball, unsound, violent, weirdo, wild,
      zealot

    

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