backbreaking
adjective
                                                                                                                            
                                                            back·break·ing
                    
                                                                                                              
                                                                                                                                  ˈbak-ˌbrā-kiŋ  
                                                      
                                                          
            
                                
              
          
                                                      : extremely arduous, exhausting, or demoralizing                                      
              
                             
backbreaking labor
                                       backbreaking rents
                         
                
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  Merriam-Webster unabridged




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