10
old-fashioned(adjective, cold, current, out, old)
10
passe(adjective, odd, current, out, old)
8
dated(adjective, odd, current, out, old)
7
antiquated(adjective, odd, current, old, primitive)
6
obsolete(adjective, odd, current, old, primitive)
6
square(adjective, current, out, old, conventional)
5
old hat(adjective, current, overfamiliar)
5
outdated(adjective, odd, current, old, primitive)
5
outmoded(adjective, odd, current, old, primitive)
4
obsolescent(adjective, odd, old, primitive, unfashionable)
4
out-of-date(adjective, odd, current, old, conventional)
4
unfashionable(adjective, odd, current, out, old)
3
out of date(expression, adjective, idiom, current)
3
time
2
archaic(adjective, odd, old, primitive, unfashionable)
2
backward
2
dead(adjective, odd, old, primitive, unacceptable)
2
has-been(adjective, current)
2
musty(adjective, tired, odd, out, old)
2
not with it(expression, idiom, tired, odd, out)
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APASmart Define. (2015). behind the times thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/behind_the_times/thesaurus/synonyms
ChicagoSmart Define. 2015. "behind the times thesaurus" https://smartdefine.org/behind_the_times/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2015, behind the times thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/behind_the_times/thesaurus/synonyms>.
MLASmart Define. "behind the times thesaurus" 13 April 2015. Web. 20 September 2026. <https://smartdefine.org/behind_the_times/thesaurus/synonyms>