life-threatening

[lahyf-thret-ning, -thret-n-ing] / ˈlaɪfˌθrɛt nɪŋ, -ˌθrɛt n ɪŋ /

ADJECTIVE

very dangerous

Synonyms

STRONGEST

deadly lethal mortal serious severe

WEAK

capital critical hazardous threatening touch and go unsafe

Antonyms

STRONGEST

harmless invigorating

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Carole was treated in hospital where doctors discovered she had suffered a life-threatening bleed on her brain.

From BBC • Apr. 10, 2026

A puppy is getting a new leash on life after being rescued with life-threatening facial injuries in Pasadena.

From Los Angeles Times • Apr. 7, 2026

The disorder causes constant, relentless hunger through hypothalamic dysfunction, where the brain fails to register fullness, often leading to life-threatening obesity.

From Barron's • Apr. 6, 2026

Such reactions can range from responses with “no clinical manifestations” to irritating rashes to life-threatening conditions such as anaphylactic shock, which constricts breathing and impairs motor function.

From Salon • Apr. 4, 2026

Later, I learn that Azaan was taken to the temple’s infirmary with several injuries, but thankfully none that are life-threatening.

From "Beasts of Prey" by Ayana Gray