needful
Not at all optional
Needful means necessary or required: I'll do whatever is needful to get this done.
The word sounds slightly formal or old-fashioned in most contexts.
As a noun, the needful is British slang for money or whatever action a situation demands: He promised to do the needful.
Indispensable, cannot omit
- requiredNeeded by rule
- indispensableUtterly required, irreplaceable
- vitalEssential or sustaining existence
- crucialOf supreme importance
requisite · imperative · fundamental · integral · core · basic · prerequisite · key
Requiring immediate attention
- immediateHappening without delay
- criticalExpressing disapproval or importance
- time-sensitiveRequiring prompt action
- priorityStatus of greater importance
desperate · dire · acute · compelling · exigent · crucial · imperative · burning
Absent or insufficient
- lackingBeing without something
- indigentExtremely poor, lacking necessities
- destituteUtterly without means
- impoverishedExtremely lacking in money
necessitous · penurious · poor
Required by rule
- compulsoryRequired, not optional
- bindingLegally or morally required
- incumbentCurrent position holder
- prescribedOfficially recommended or mandated
stipulated · enforced · demanded · required · imposed · dictated · ordained · commanded
necessary
Indispensable, cannot omit
- requiredNeeded by rule
- indispensableUtterly required, irreplaceable
- vitalEssential or sustaining existence
crucial · requisite · imperative · fundamental · integral · core · basic · prerequisite · key · critical
pressing
Requiring immediate attention
- immediateHappening without delay
- criticalExpressing disapproval or importance
- time-sensitiveRequiring prompt action
priority · desperate · dire · acute · compelling · exigent · crucial · imperative · burning · demanding
wanting
Absent or insufficient
- lackingBeing without something
- indigentExtremely poor, lacking necessities
- destituteUtterly without means
impoverished · necessitous · penurious · poor
mandatory
Required by rule
- compulsoryRequired, not optional
- bindingLegally or morally required
- incumbentCurrent position holder
prescribed · stipulated · enforced · demanded · required · imposed · dictated · ordained · commanded · decreed
needfulunnecessary
Not essential or required
needless · unneeded · nonessential · dispensable · superfluous
needfulaffluent
Having abundant financial resources
prosperous · comfortable · abundant · flush · well-off
- do the needfulPerform what's required
- doing the needfulPerforming what's required
- Needful ThingsRequired items or essentials
- did the needfulPerformed necessary action