11
erstwhile(adjective, last, original, primitive, venerable)
11
former(adjective, last, original, dead, primitive)
11
quondam(adjective, last, original, primitive, venerable)
9
old(adjective, last, past, other, outdated)
9
sometime(adjective, adverb, last, original, past)
8
past(adjective, last, original, primitive, outdated)
7
late(adjective, last, original, dead, primitive)
7
previous(adjective, last, dead, other, former)
6
bygone(adjective, last, original, past, primitive)
6
once(adjective, adverb, last, original, past)
5
olden(adjective, original, old, past, primitive)
5
whilom(adjective, precede)
4
prior
3
Old
3
ancient
2
early(last, original, past, primitive, venerable)
2
formerly
2
immemorial(last, original, past, primitive, venerable)
2
one-time(last, previous, other, former)
2
preceding(previous, former, deceased)
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APASmart Define. (2015). onetime thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/onetime/thesaurus/synonyms
ChicagoSmart Define. 2015. "onetime thesaurus" https://smartdefine.org/onetime/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2015, onetime thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/onetime/thesaurus/synonyms>.
MLASmart Define. "onetime thesaurus" 14 April 2015. Web. 20 September 2026. <https://smartdefine.org/onetime/thesaurus/synonyms>