1
                    as in lunatic
                                                
              
          
                                                      a person who lacks good sense or judgment                                       
              
                             quit acting like a nincompoop, because I know you are smarter than that                         
                
                                                                                                                                                                          
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2
                    as in moron
                                                
              
          
                                                      a stupid person                                       
              
                             who wants a nincompoop as a business partner?                         
                
                                                                                                                                                                                                                                                              
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Antonyms & Near Antonyms
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  Merriam-Webster unabridged




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