imperative Synonyms

required pressing important commanding imperious vital compelling urgent crucial essential indispensable imperative mood necessary requirement mandatory authoritative ought overruling paramount peremptory precondition prescript predominant tyrannical prerequisite order needful obligation needed need necessity must obligatory optative masterful mandate prime all important of the essence jussive mood imperative form evaluative life-and-death mandatorily non-finite ergative sine qua non time-sensitive wanted urgency