obligatory Synonyms

bounden mandatory conforming to accepted standards required pressing prescribed prerequisite peremptory payable obligation needful needed necessary must mandatary requisite restringing statutory incumbent on de rigueur nonelective mandatorily of the essence all important vital urgent unavoided unavoidable sumptuary substantive stipulated irremissible involuntary dictated demanded crucial critical constraining compulsory compulsatory compelling coercive clamant bindingly binding bound enforced essential exigent inevitable