30 entries under lost topic. ×

20
erstwhile(adjective, last, original, dead, late)
19
former(adjective, adverb, order, time, last)
16
sometime(adjective, adverb, last, original, dead)
14
previous(adjective, adverb, last, dead, late)
13
late(adjective, last, original, dead, old)
10
ancient(adjective, dead, late, old, past)
10
one-time(adjective, last, dead, late, old)
7
olden(adjective, original, dead, late, old)
4
extinct(adjective, dead, past, previous)
2
of yore(expression, adjective, last, original, dead)
1
antiquated(adjective, last, original, dead, past)
1
archaic(adjective, last, original, dead, past)
1
belated(adjective, dead, past, previous)
1
dated(adjective, last, original, dead, past)
1
dead(adjective, past, previous, former)
1
defunct(adjective, dead, past, previous)
1
departed(adjective, dead, old, past)
1
down memory lane(expression, idiom, dead, late, old)
1
forgotten(adjective, dead, past, previous)
1
gone(adjective, dead, past, previous)
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APASmart Define. (2015). quondam thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/quondam/thesaurus/synonyms
ChicagoSmart Define. 2015. "quondam thesaurus" https://smartdefine.org/quondam/thesaurus/synonyms (accessed September 26, 2026).
HarvardSmart Define 2015, quondam thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/quondam/thesaurus/synonyms>.
MLASmart Define. "quondam thesaurus" 14 April 2015. Web. 26 September 2026. <https://smartdefine.org/quondam/thesaurus/synonyms>