Vital
Essential
Synonyms: Essential, crucial, necessary, required, important, of the utmost importance, of the essence, life-and-death, mandatory, pressing, compelling, paramount, high-priority, consequential, indispensable, key, needed, requisite, all-important, of great consequence, critical, imperative, urgent, burning, acute, pre-eminent, significant, and earth-shattering.
Life-preserving
Synonyms: Life-preserving, basic, essential, major, chief, prime, life-sustaining, fundamental, necessary, main, and key.
Lively
Synonyms: Lively, active, spry, spirited, vivacious, bouncy, vibrant, sparkling, vigorous, forceful, lusty, in fine fettle, zippy, feisty, raring to go, bright-eyed and bushy-tailed, energetic, sprightly, animated, high-spirited, exuberant, enthusiastic, zestful, dynamic, full of vim and vigour, fiery, hale and hearty, go-getting, peppy, spunky, full of beans, and chipper.
Example Sentences
Hydration is vital for health.
Sleep is vital for recovery.
Teamwork is vital to success.
Vitamins are vital for growth.