Synonyms of obligatory in English:

obligatory


See definition of obligatory

adjective

1‘use of seat belts in cars is now obligatory’

SYNONYMS

compulsory, mandatory, prescribed, required, demanded, statutory, enforced, binding, incumbent

requisite, necessary, imperative, unavoidable, inescapable, essential

ANTONYMS

voluntary, optional

2‘after the obligatory preamble on the weather he got down to business’

SYNONYMS

customary, traditional, usual, accustomed, routine, familiar, regular, habitual

de rigueur

literary wonted