life-threatening
adjective uk/ˈlaɪfˌθret.ən.ɪŋ/ us/ˈlaɪfˌθret.ən.ɪŋ/
（疾病）致命的，危及生命的
A life-threatening disease is a very serious one that can cause death.
life-threatening diseases such as cancer 癌症等危及生命的疾病
Compare: grievous grave adjectiveserioussevere