Antonyms of adj life-threatening

1 sense of life-threatening

Sense 1
dangerous, grave, grievous, serious, severe, life-threatening -- (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")

INDIRECT (VIA critical) -> noncritical, noncrucial -- (not in a state of crisis or emergency)

Similarity of adj life-threatening

1 sense of life-threatening

Sense 1
dangerous, grave, grievous, serious, severe, life-threatening -- (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")
       => critical (vs. noncritical) -- (being in or verging on a state of crisis or emergency; "a critical shortage of food"; "a critical illness"; "an illness at the critical stage")