compulsory Synonyms

mandatory required obligatoriness obligation needful needed necessary must must-have mandatary irrevocable irremissible involuntary inexorable inevitable inescapable ineludible obligatory obliged peremptory de rigueur nonelective mandatorily all important vital urgent unevitable unavoided unavoidable sumptuary stipulated requisite pressing prescribed prerequisite ineluctable indispensable incumbent constrained compulsorily compulsive compulsatory compelling compelled coercive coactive clamant certain bindingly binding