10
once(adjective, adverb, late, old, past)
8
before(adverb, late, earlier, then, once)
7
away back(expression, adverb, late, past, earlier)
6
previously(adverb, formerly)
5
ages ago(expression, adverb, past, memories, old times)
5
already(adverb, late, earlier, then, before)
5
earlier(adjective, adverb, late, old, past)
5
of yore(expression, adjective, adverb, old, past)
5
once upon a time(expression, idiom, adverb, late, past)
5
some time ago(expression, idiom, adverb, late, earlier)
4
erstwhile(adjective, adverb, late, old, past)
4
lang syne(expression, adverb, past, memories, old times)
3
anciently(adverb, earlier, then, before, once)
3
heretofore(adverb, late, earlier, then, before)
3
in ancient times(expression, idiom)
3
long since
3
of old(expression, adjective, adverb, earlier, then)
2
aforetime(adverb, earlier, then, before, once)
2
at one time(expression, idiom, adverb, late, earlier)
2
back(adverb, late, earlier, then, before)
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APASmart Define. (2015). long ago thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/long_ago/thesaurus/synonyms
ChicagoSmart Define. 2015. "long ago thesaurus" https://smartdefine.org/long_ago/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2015, long ago thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/long_ago/thesaurus/synonyms>.
MLASmart Define. "long ago thesaurus" 14 April 2015. Web. 21 September 2026. <https://smartdefine.org/long_ago/thesaurus/synonyms>