life-threatening
adjective
life-threat·en·ing ˈlīf-ˌthret-niŋ 
-ˌthre-tᵊn-iŋ
: capable of causing death : potentially fatal
a life-threatening disease/condition
The injuries are serious but not life-threatening.
Word History
First Known Use
1759, in the meaning defined above
Medical Definition
life-threatening
adjective
life-threat·en·ing ˈlīf-ˌthret-ən-iŋ
: capable of causing death : potentially fatal
life-threatening injuries
a life-threatening allergic reaction
life-threatening arrhythmia
- undesirable
- undesirable discharge
- undesirableness
- undesirablenesses
- undesirables
- undesirably
- undesire
- undesired
- undesiring
- undesirous
- undespairing
- undespoiled
- undestroyable
- undetachable
- undetached
- undetd
- undetectable
- undetectably
- undetected
- undeterminable
- undeterminably
- undeterminate
- undetermined
- undeterred
- undevelopable