incombustible
adjective
                                                                                                                            
                                                            in·com·bus·ti·ble
                    
                                                                                                              
                                                                                                                                  ˌin-kəm-ˈbə-stə-bəl  
                                                      
                                                          
            
                                
              
          
                                                      : not combustible : incapable of being burned                                      
                
                    
                                                      incombustible
                                      noun
                                                                            
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  Merriam-Webster unabridged




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