3
earliest
3
has-been(dead, tired, out, bent, antiquated)
3
immemorial(last, original, past, primitive, venerable)
3
old hat
3
original(adjective, last, past, primitive, primary)
3
out-of-date(old, venerable, obsolete, antique, antiquated)
3
past(last, original, primitive, venerable, unfashionable)
3
relic(last, original, old, venerable, outdated)
3
vintage(feature, characteristic, detail, unfashionable, outdated)
2
antediluvian patriarch(noun, expression, idiom)
2
antemundane
2
conservative(noun, conventional, reactionary, fuddy-duddy)
2
dead(adjective, out, unfashionable, antique, antiquated)
2
decrepit(feature, characteristic, detail)
2
disused(adjective, dead, tired, out, bent)
2
elderly(adjective, old)
2
fossilized(tired, bent, unfashionable, outdated, obsolete)
2
fud
2
fuddy-duddy(noun, conventional, conservative, reactionary)
2
grown old(expression, unfashionable, antiquated, archaic)
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APASmart Define. (2015). antediluvian thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/antediluvian/thesaurus/synonyms
ChicagoSmart Define. 2015. "antediluvian thesaurus" https://smartdefine.org/antediluvian/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, antediluvian thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/antediluvian/thesaurus/synonyms>.
MLASmart Define. "antediluvian thesaurus" 14 April 2015. Web. 22 September 2026. <https://smartdefine.org/antediluvian/thesaurus/synonyms>