15
erstwhile(adjective, last, dead, late, old)
15
former(adjective, order, time, last, dead)
10
quondam(adjective, last, dead, late, old)
9
late(adjective, last, dead, old, past)
8
old(adjective, last, late, past, previous)
8
past(adjective, old, previous, former, departed)
8
prior(adjective, late, old, past, previous)
7
previous(adjective, last, dead, late, old)
6
sometime(adjective, last, dead, late, old)
5
once(adjective, last, late, old, past)
4
last(adjective, past, previous, other, ex-)
4
preceding(adjective, late, old, past, previous)
4
recent(adjective, late, old, past, previous)
3
earlier(adjective, late, old, past, previous)
3
whilom
2
ancient(adjective, dead, late, old, past)
2
bygone(adjective, last, late, old, past)
2
down memory lane(expression, idiom, dead, late, old)
2
ex-(adjective, late, old, past, previous)
2
onetime(last, previous, other, former)
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APASmart Define. (2015). one-time thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/one-time/thesaurus/synonyms
ChicagoSmart Define. 2015. "one-time thesaurus" https://smartdefine.org/one-time/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2015, one-time thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/one-time/thesaurus/synonyms>.
MLASmart Define. "one-time thesaurus" 14 April 2015. Web. 20 September 2026. <https://smartdefine.org/one-time/thesaurus/synonyms>