85 entries under adjective topic. ×

6
old-time(dull, new, last, original)
5
outworn(odd, old, primitive, unfashionable)
5
old hat(expression, idiom, plain, square)
5
oldfangled(last, original, odd, old)
5
unfashionable(plain, last, original, odd)
4
behind the times(expression, idiom, odd, current)
4
bygone(plain, new, last, original)
4
disused
4
musty(odd, old, primitive, unfashionable)
4
out(adverb, odd, old, primitive)
3
belated
3
dead(odd, old, primitive, unfashionable)
3
expired(feature, characteristic, trait)
3
late(last, original, late, venerable)
3
stale(last, original, tired, venerable)
2
aged
2
defunct(obsolete, invalid, outmoded, redundant)
2
demoded(odd, old, primitive, unfashionable)
2
frumpy(plain, shabby, drab, dingy)
2
moldy(plain, odd, old, drab)
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APASmart Define. (2015). outdated thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/outdated/thesaurus/synonyms
ChicagoSmart Define. 2015. "outdated thesaurus" https://smartdefine.org/outdated/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, outdated thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/outdated/thesaurus/synonyms>.
MLASmart Define. "outdated thesaurus" 10 April 2015. Web. 22 September 2026. <https://smartdefine.org/outdated/thesaurus/synonyms>