freak - definition and synonyms

noun [countable] 

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  1. 1
    something with very unusual features that make it very different from other things of its type
  2. 2
    someone who looks strange or who behaves in a strange way

    If you don’t like sport they regard you as a freak.

     Synonyms and related words
  3. 3
    informal someone who is extremely interested in a particular subject or activity

    a fitness/health freak