unchangeable
adjective
                                                                                                                            
                                                            un·change·able
                    
                                                                                                              
                                                                                                                                  ˌən-ˈchān-jə-bəl  
                                                      
                                                          
            
                                
              
          
                                                      : not changing or to be changed : immutable                                      
              
                             
unchangeable documents
                                       unchangeable facts
                         
                
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  Merriam-Webster unabridged




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