long since
Adverb
Meaning
of the distant or comparatively distant past
Source: WordNetSynonyms
long ago
lang syne
anciently
yore
langsyne
time immemorial
foretime
time out of mind
month of Sundays
many moons ago
in the past
of old
way back
old times
back in the day
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Antonyms
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We met once long ago
they long ago forsook their nomadic life
left for work long ago
he has long since given up mountain climbing
This name has long since been forgotten
lang syne