How to Say "life-sustaining" in Spanish
The Spanish word for “life-sustaining” is “vital” — B2 level.
English → SpanishB2
adjectiveB2formal
necessary for survival

Examples
La enfermera revisó los signos vitales del paciente.
The nurse checked the patient's vital signs.
El corazón cumple una función vital en el cuerpo humano.
The heart fulfills a vital function in the human body.
Context Clues
When 'vital' is used with medical or biological words (like 'signos' or 'funciones'), it usually refers to the actual processes needed for living, not just abstract importance.
Related Translations
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