vital

acute alive alive animate animated basic bottom line brawnier brawny burning capital cardinal chiefest chief climactic constitutional constitutive critical crucial effervescent energetic essential fresh fresher freshest full-blooded fundamental grave gravest impressive imperative important indispensable kinetic key life-and-death live live living lusty main major material meat and potatoes momentous more acute more alive more alive more crucial more critical more impressive more necessary more needed more pressing more primary more significant more requisite more required more required more robust more urgent most crucial most basic most fundamental most needed most required most required most primary most pressing most robust most requisite most urgent most significant must-have needed necessary newsworthy on the ball organic peaches-and-cream pivotal prerequisite pressing primary radical required/requisite required robust significant sound strategic strenuous underlying urgent vibrant vigorous virile vivacious zippy