niggling
adjective
                                                                                                                            
                                                            nig·gling
                    
                                                                                                              
                                                                                                                                  ˈni-g(ə-)liŋ  
                                                      
                                                          
            
                                
              
          
                                                      : petty                                      
                
                                
            also                
          
                                                      : bothersome or persistent especially in a petty or tiresome way                                       
              
                             
            niggling injuries    
                         
            
                                                      niggling
                                      noun
                                                                            
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  Merriam-Webster unabridged




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