Definition of maniac in English:

maniac

noun

  • 1A person exhibiting extremely wild or violent behaviour:

    ‘when he sits in front of a PlayStation he transforms into a karate-choppin' maniac’
    • ‘I just laughed like a maniac, remembering previous events.’
    • ‘I don't endorse driving like a maniac, but yesterday I drove like one.’
    • ‘He is not a homicidal maniac, but a violent, evil man made even more so by his addiction to unnamed drugs.’
    • ‘‘Yes, and I'm laughing like a maniac, too,’ Selas growled in response.’
    • ‘I arose from bed to see why Stan yelled like a maniac.’
    • ‘He pounded one hand on my back, grinning like a maniac.’
    • ‘I ducked my head so I wouldn't start grinning like a maniac.’
    • ‘Lee was still on the phone giggling like a maniac.’
    • ‘Johnson starts roaring like a maniac, laughing like there's no tomorrow.’
    • ‘I lost several pounds and I looked like a maniac.’
    • ‘Instead, she is standing on a corner in Edinburgh's New Town, clutching a large, flowery bag, waving like a maniac.’
    • ‘He had done his duty to the community by shutting up a wandering and probably dangerous maniac.’
    • ‘Swinging around like a maniac would get me nowhere.’
    • ‘He was puffing slightly and grinning like a maniac.’
    • ‘I know I am a paranoid, psychotic, evil maniac.’
    • ‘I can almost see him, hunched over the drawing board, laughing like a maniac as each scene explodes into life before his eyes.’
    • ‘The driver was screaming like a maniac at this stage.’
    • ‘He was a psychotic maniac who got what he deserved.’
    • ‘He screamed, running like a maniac to the side of my car.’
    • ‘He's not some crazy maniac, he's just somebody you would want to talk to.’
    1. 1.1informal [with adjective or noun modifier] An obsessive enthusiast:
      ‘a religious maniac’
      • ‘This was one for the war buffs amongst the motoring maniacs.’
      • ‘I just don't think at any stage they are going to be able to make a credible case that he is some sort of right-wing maniac.’
      • ‘A night of petrol-fuelled hedonism is in store at Wimbledon Greyhound Stadium on Sunday where motor maniacs can admire a human canon ball, a monster truck, fire stunts and car crashes.’
      enthusiast, fan, addict, devotee, aficionado
      View synonyms
    2. 1.2Psychiatry archaic A person suffering from mania.
      lunatic, madman, madwoman, mad person, deranged person, psychopath, psychotic
      View synonyms

Origin

Early 16th century (as an adjective): via late Latin from late Greek maniakos, from mania (see mania).

Pronunciation:

maniac

/ˈmeɪnɪak/