nonoptional
You have to
Nonoptional means required or mandatory—something that cannot be skipped or declined.
A nonoptional fee must be paid; a nonoptional course must be taken to graduate.
The word emphasizes that choice has been removed: Attendance at the safety briefing is nonoptional.
Required, not optional
- obligatoryRequired by rule
- requiredNeeded by rule
- bindingLegally or morally required
- enforcedMade to be followed
imperative · requisite · prerequisite · dictated · prescribed · decreed · commanded · demanded
Indispensable, cannot omit
- indispensableUtterly required, irreplaceable
- criticalExpressing disapproval or importance
- vitalEssential or sustaining existence
- fundamentalForming the base
integral · paramount · crucial · core · key · central · basic · intrinsic
Impossible to avoid
- unavoidableImpossible to prevent
- certainFree from doubt
- guaranteedPromised with certainty
- predeterminedEstablished beforehand
predestined · fated · assured · inexorable · unpreventable · bound · destined · foregone
compulsory
Required, not optional
- obligatoryRequired by rule
- requiredNeeded by rule
- bindingLegally or morally required
enforced · imperative · requisite · prerequisite · dictated · prescribed · decreed · commanded · demanded · imposed
necessary
Indispensable, cannot omit
- indispensableUtterly required, irreplaceable
- criticalExpressing disapproval or importance
- vitalEssential or sustaining existence
fundamental · integral · paramount · crucial · core · key · central · basic · intrinsic · constitutive
inescapable
Impossible to avoid
- unavoidableImpossible to prevent
- certainFree from doubt
- guaranteedPromised with certainty
predetermined · predestined · fated · assured · inexorable · unpreventable · bound · destined · foregone · ineluctable
nonoptionaloptional
Not mandatory
voluntary · elective · discretionary · nonmandatory · noncompulsory
option, options, optional, optionally, opting, opt-out, opt-in