supererogatory

More than necessary

Supererogatory describes actions that go beyond what duty or obligation requires—doing more than what's expected or necessary.

The term comes from Catholic moral theology, where it referred to good works performed beyond what God demands for salvation.

In everyday use, it often carries a slightly ironic edge, suggesting excessive or unnecessary effort: His supererogatory apologies only made the situation more awkward.

Something supererogatory may be admirable when it reflects genuine generosity, or tiresome when it seems like showing off.

optional

nonobligatory

Not compulsory or mandated

unrequired · noncompulsory · permissible · freely given · unprompted · spontaneous · unbidden · unsolicited · gratuitous · supplementary

excessive

superfluous

Exceeding what suffices

overabundant · unneeded · dispensable · extraneous · gratuitous · overkill · unwarranted · needless · expendable · inessential

moral

meritorious

Deserving praise or honor

righteous · selfless · heroic · praiseworthy · commendable · laudable · exemplary · magnanimous · benevolent · charitable

Opposites
obligation and moral requirement

supererogatoryobligatory

Required by rule

mandatory · required · necessary · compulsory · duty-bound

sufficiency and adequacy

supererogatoryinsufficient

Below required quantity

deficient · inadequate · lacking · wanting · short

Family

supplement, supervisor, supernatural, supersede, superintendent, superlative, supersonic, supercilious, supernumerary

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Used worldwide · Timeless · Abstract · Rated G