| of yore(expression, adjective, last, original, dead) | |
| old-fangled(adjective, odd, old, primitive, unfashionable) | |
| old-timey | |
| old-world | |
| once(last, original, past, venerable, outdated) | |
| one-time(adjective, last, dead, past, lost) | |
| onetime(last, original, past, venerable, outdated) | |
| original(last, past, venerable, other, outdated) | |
| out-of-style(adjective, odd, out, old, primitive) | |
| out of it(expression, idiom, odd, old, primitive) | |
| out of season(expression, idiom) | |
| out of use(expression, idiom) | |
| over | |
| overdue | |
| parachronistic | |
| partnered(noun, verb) | |
| passed | |
| passed away | |
| past due | |
| perioded |
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| APA | Smart Define. (2015). dated thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/dated/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "dated thesaurus" https://smartdefine.org/dated/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2015, dated thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/dated/thesaurus/synonyms>. |
| MLA | Smart Define. "dated thesaurus" 10 April 2015. Web. 22 September 2026. <https://smartdefine.org/dated/thesaurus/synonyms> |