10 mandatory synonyms include obligatory, compulsory, binding, required, inescapable, unavoidable, requisite, necessary, essential, and imperative. Mandatory is an adjective, and its antonyms are optional and voluntary.. Here are some additional synonyms for "mandatory" with example sentences.
10 other ways to say mandatory.
Adherence to the rules is mandatory in this game.
Compliance with regulations is mandatory always.
Validation of credentials is mandatory.