Lively
life-sustaining, essential
* necessary * vital * important
Essential, vital, necessary.
Necessary
needful, compulsory, vital, crucial
medium, device, vital part, harmonium
crucial, essential, key, significant, necessary
Energetic, vital, go-ahead, lively, animated, high-powered, forceful
Basic, important, central, crucial, major, necessary, vital, or significant. Those a synonyms for fundamental.
Basic, important, central, crucial, major, necessary, vital, or significant. Those a synonyms for fundamental.
The verb form has the synonyms asked, needed, requested, ordered, mandated or called for. The adjective form has the synonyms necessary, needed, essential, vital, requisite, prerequisite, or mandatory.
longevity prolongation preservation stay vital stay lively to continue survivability livelihood endurance