life-threatening

Adjective
  1. Causing fear or anxiety by threatening great harm (synset 300654061)
    "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"
    similar to: critical - being in or verging on a state of crisis or emergency
    same as: dangerous, grave, grievous, serious, severe

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