life-threatening
adjective
                                                                                                                            
                                                            life-threat·en·ing
                    
                                                                                                              
                                                                                                                                  ˈlīf-ˌthre-tᵊn-iŋ  
                                                                                                                              
            -ˌthret-niŋ
                                                      
                                                          
                                
              
          
                                                      : capable of causing death : potentially fatal                                      
              
                             
a life-threatening disease/condition
                                       The injuries are serious but not life-threatening.
                         
                
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  Merriam-Webster unabridged




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