life-threatening

Adjective

• causing fear or anxiety by threatening great harm
  • a dangerous operation
    
  • a grave situation
    
  • a grave illness
    
  • grievous bodily harm
    
  • a serious wound
    
  • a serious turn of events
    
  • a severe case of pneumonia
    
  • a life-threatening disease
    

Related words

• Synonyms: 
  dangerous , grave , grievous , serious , severe