Definition of idiot noun from the Oxford Advanced American Dictionary

     

    idiot

     noun
    noun
    NAmE//ˈɪdiət//
     
     
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  1. 1(informal) a very stupid person synonym fool When I lost my passport, I felt such an idiot. Not that switch, you idiot!
  2. 2 (old use) (offensive) a person with very low intelligence who cannot think or behave normally
See the Oxford Advanced Learner's Dictionary entry: idiot