for good
• forever; definitively.
• "the experience almost frightened me away for good"
Similar:
forever,
permanently,
for always,
for good and all,
perpetually,
eternally,
(for) evermore,
for ever and ever,
for all (future) time,
until/to the end of time,
world without end,
endlessly,
timelessly,
for eternity,
in perpetuity,
everlastingly,
enduringly,
never to return,
aye,
forevermore,
for keeps,
until hell freezes over,
until doomsday,
until the cows come home,
for aye,
immortally,
deathlessly,
imperishably,
abidingly,
sempiternally,
perdurably,