Antonyms of adj life-sustaining

1 sense of life-sustaining

Sense 1
vital, life-sustaining -- (performing an essential function in the living body; "vital organs"; "blood and other vital fluids"; "the loss of vital heat in shock"; "a vital spot"; "life-giving love and praise")

INDIRECT (VIA essential) -> inessential, unessential -- (not basic or fundamental)

Similarity of adj life-sustaining

1 sense of life-sustaining

Sense 1
vital, life-sustaining -- (performing an essential function in the living body; "vital organs"; "blood and other vital fluids"; "the loss of vital heat in shock"; "a vital spot"; "life-giving love and praise")
       => essential (vs. inessential) -- (basic and fundamental; "the essential feature")