crucial Synonyms

essential critical important imperative all important decisive grave vital fundamental urgent serious indispensable key pivotal major momentous necessary paramount primary retiform right-hand salient seminal palmiped significant resultful requisite principal prominent relevant rememberable prime pressing required prerequisite preeminent portentous overriding strategic crit life-and-death life-or-death lifesaving heavy-duty meaningful nonintersecting in particular high-stakes straight-laced supercritical