vital Synonyms

critical key indispensable life-sustaining major imperative lively paramount crucial important essential necessary urgent fundamental serious relevant strategic significant spry significative sprightly sprightful spirited virile structural seminal perky physiological pivotal portentous prerequisite pressing prime primary principal quick quickening required requisite rompish salient resuscitative substantial axiological Bangui zestful Frisch life-and-death life-or-death bouncy