life-threatening

Adjective
1. 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"
(synonym) dangerous, grave, grievous, serious, severe
(similar) critical

That can cause death.

life-threatening
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