maniac - definition and synonyms

noun [countable] 

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/ˈmeɪniæk/
singularmaniac
pluralmaniacs
  1. 1
    informal someone who behaves in a stupid and dangerous way

    Slow down! You’re driving like a maniac.

  2. 2
    informal someone who is considered strange because they have an extremely strong enthusiasm for something

    a religious maniac

     Synonyms and related words