irresistible impulse
noun
                                                                                                                            
                                                            ir·re·sis·ti·ble im·pulse
                    
                                                                                                              
                                                                                                                              
            ˌir-rə-ˈzis-tə-bəl-
                                                      
                                                          
                                
              
          
                                                      : an overpowering impulse produced by mental disease or defect that leads to the commission of a criminal act (as murder)                                      
                
                    
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  Merriam-Webster unabridged




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