venfu -vef- gismu

x1 takes revenge on/retaliates against x2 (person) for wrong x3 (nu) with vengeance x4 (nu).

Also avenge; (adjective:) x1 is vengeful. See also sfasa, cnemu.


In notes:

cnemu
x1 (agent) rewards x2 [recipient] for atypical x3 (event/property) with reward/desserts x4.
sfasa
x1 (agent) punishes x2 for infraction x3 (event/state/action) with punishment x4 (event/state).
vendeta
x1 is a vendetta against x2 for wrong x3 with vengeance x4