obligatory
adjectiveOf the nature of an obligation; compulsory.
adjectiveRequired as part of a routine course of action or cultural expectation; predictable.
adjectiveObligate.
Imposing obligation; binding in law or conscience; imposing duty; requiring performance of or forbearance from some act: followed by on before the person, formerly by to.
adjectiveBinding in law or conscience; imposing duty or obligation; requiring performance or forbearance of some act; — often followed by
Imposing obligation, morally or legally;
Requiring a matter or
required by obligation or compulsion or convention
adjectivemorally or legally constraining or binding