Antonyms of adj ex_gratia

1 sense of ex gratia

Sense 1
ex gratia -- (as a favor; not compelled by legal right; "ex gratia payments made to nonstriking workers")

INDIRECT (VIA optional) -> obligatory -- (morally or legally constraining or binding; "attendance is obligatory"; "an obligatory contribution")

Similarity of adj ex_gratia

1 sense of ex gratia

Sense 1
ex gratia -- (as a favor; not compelled by legal right; "ex gratia payments made to nonstriking workers")
       => optional (vs. obligatory) -- (possible but not necessary; left to personal choice)