naysayer
noun
                                                                                                                            
                                                            nay·say·er
                    
                                                                                                              
                                                                                                                                  ˈnā-ˌsā-ər  
                                                                                                                              
            -ˌser
                                                      
                                                          
                                
              
          
                                                      : one who denies, refuses, opposes, or is skeptical or cynical about something                                      
              
                             
There are always naysayers who say it can't be done.
                         
                
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  Merriam-Webster unabridged




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