What is the opposite of optional?

Need antonyms for optional? Here's a list of opposite words from our thesaurus that you can use instead.

Contexts Opposite of left to personal choice Opposite of of less than primary importance Opposite of done deliberately through one's own volition after thorough consideration Opposite of outside of, or additional to, the normal educational curriculum or one's duties Adjective ▲ Opposite of left to personal choice compulsory essential mandatory necessary enforced obligatory required compulsatory requisite unavoidable incumbent inescapable forced nonvoluntary set imperative prescribed enforceable peremptory nonelective contractual statutory binding stipulated de rigueur needed indispensable important needful vital significant crucial key fundamental pivotal integral necessitous critical consequential must-have all-important basic central paramount prerequisite all important vitally important high priority high-priority of the utmost importance of great consequence appropriate compelling core urgent pre-eminent elementary of the essence nondiscretionary burning appointed useful intrinsic recommended exigent rudimentary principal demanded cardinal valuable inherent innate desired worthwhile called for justified deserved provoked warranted just justifiable designed careful acute pressing planned substantive life-and-death “We have made it compulsory for first-year students to attend classes twice a week in the lab.” Adjective ▲ Opposite of of less than primary importance primary core fundamental principal chief key main premier prime principle capital central dominant greater intrinsic major predominant underlying arch cardinal characteristic crucial elementary essential focal head overriding pivotal preeminent prominent root staple basal basic critical elemental first foremost highest lead leading master paramount prevailing quintessential sovereign supreme top true ultimate vital commanding controlling foundational grand greatest high natural presiding primordial rudimentary ruling salient strongest superordinate number-one pre-eminent strong number one numero uno most important “If the primary feature of a sports board game is dice, it's probably going to be unexciting.” Adjective ▲ Opposite of done deliberately through one's own volition after thorough consideration coerced compelled forced involuntary nonvoluntary unwilled will-less Adjective ▲ Opposite of outside of, or additional to, the normal educational curriculum or one's duties regular Find more words! 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Sentences with the word optional Words that rhyme with optional What is the plural of optional? What is the adverb for optional? What is the adjective for optional? What is the noun for optional? Translations for optional Use our Antonym Finder Nearby Words optional curriculum optional extra optionalize optionally optional session optional subject option opting out of opting out opting in opting opt-in 8-letter Words Starting With o op opt opti optio option optiona