20
former(noun, adjective, order, time, last)
20
past(verb, adjective, phrasal verb, last, original)
14
old(adjective, new, last, dead, odd)
13
ancient(adjective, dead, odd, late, out)
12
departed(adjective, tired, old, past, lost)
11
archaic(adjective, plain, new, last, original)
11
gone(adjective, dead, past, lost, outmoded)
11
old-fashioned(adjective, new, original, old, past)
11
antique(noun, adjective, value, new, last)
11
dead(adjective, odd, out, old, past)
11
extinct(adjective, dead, odd, out, old)
11
olden(adjective, original, odd, late, old)
11
vintage(adjective, plain, new, odd, old)
10
antediluvian(original, dead, old, venerable, outdated)
10
antiquated(adjective, plain, new, last, original)
10
erstwhile(adjective, last, original, late, old)
10
forgotten(adjective, out, past, oblivion, the past)
10
late(adjective, last, original, dead, old)
9
obsolete(adjective, last, original, dead, odd)
9
old-time(adjective, new, last, original, odd)
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APASmart Define. (2015). bygone thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/bygone/thesaurus/synonyms
ChicagoSmart Define. 2015. "bygone thesaurus" https://smartdefine.org/bygone/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2015, bygone thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/bygone/thesaurus/synonyms>.
MLASmart Define. "bygone thesaurus" 10 April 2015. Web. 21 September 2026. <https://smartdefine.org/bygone/thesaurus/synonyms>