That cannot be avoided; inevitable
Compelled, mandated, obligatory, or required, especially if by legal process or a statute.
(Biochemistry) Being a substance that is required for normal functioning but cannot be synthesized by the body and therefore must be included in the diet:
Serving to bind:
Imposed on one by authority, command, or convention
Not remissible; unpardonable:
The definition of optional is available, but not required.
(Law) Without legal obligation or consideration:
The definition of requisite is something required or necessary.
Of coercion or tending to coerce
The definition of imperative is something that has authority or is absolutely necessary.
The definition of incumbent is laying on top of something.
Find another word for obligatory. In this page you can discover 20 synonyms, antonyms, idiomatic expressions, and related words for obligatory, like: required, unavoidable, compulsory, essential, necessary, binding, obligation, irremissible, mandatory, discretional and optional.