compulsory Synonyms

mandatory required indispensable requisite enforced obligatory essential necessary forced imperative compelled binding unavoidable sumptuary needful needed all important mandatorily must nonelective ministerial de rigueur mandatary legal irrevocable irremissible obligation peremptory must-have stipulated statutory unavoided unevitable regulated pressing prescribed prerequisite urgent oppressive obliged vital obligatoriness involuntary inexorable inevitable constraining constrained compulsorily compulsive compulsatory