maniac maniac /ˈmeɪniːˌæk/

adjective

1. Wildly disordered  ( maniac , maniacal )
   wildly disordered
    A maniacal frenzy
   a maniacal frenzy
   

noun

1. () An insane person  ( lunatic , headcase [Informal] , madman , maniac )
   an insane person
     The deranged madman rambled on the street, lost in his own delusions.
   The deranged madman rambled on the street, lost in his own delusions.
   
2. A person who has an obsession with or excessive enthusiasm for something  ( maniac )
   a person who has an obsession with or excessive enthusiasm for something