- Definitions|2
- Thesaurus|1.3k
- Abbreviations|0
| once(last, original, past, primitive, venerable) | |
| onetime(last, original, past, primitive, venerable) | |
| out of fashion(expression, adjective, idiom) | |
| out of style(expression, idiom, unfashionable, antiquated, archaic) | |
| outworn(dead, out, old, unfashionable, antiquated) | |
| over | |
| passé(adjective, prehistoric) | |
| passed away(verb, phrasal verb, the past) | |
| petrified | |
| pop | |
| pops | |
| preclassical | |
| precultural | |
| prehistoric man | |
| prehuman | |
| prelapsarian | |
| premillenarian | |
| premundane | |
| prerevolutionary | |
| preromantic |
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| APA | Smart Define. (2015). antediluvian thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/antediluvian/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "antediluvian thesaurus" https://smartdefine.org/antediluvian/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2015, antediluvian thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/antediluvian/thesaurus/synonyms>. |
| MLA | Smart Define. "antediluvian thesaurus" 14 April 2015. Web. 22 September 2026. <https://smartdefine.org/antediluvian/thesaurus/synonyms> |