vital

urgently needed; absolutely necessary; "a critical element of the plan"; "critical medical supplies"; "vital for a healthy society"; "of vital interest"

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"

full of spirit; "a dynamic full of life woman"; "a vital and charismatic leader"; "this whole lively world"

manifesting or characteristic of life; "a vital, living organism"; "vital signs"