| antique(noun, adjective, ancient) | |
| antediluvian(adjective, ancient, oldness) | |
| trace(noun, verb, time, remains) | |
| dodo | |
| fogy(noun, new, square) | |
| archaic(adjective, ancient, oldness) | |
| relic(noun, verb, time, remains) | |
| antiquated | |
| fogey | |
| impression(noun, verb, time, remains) | |
| ancient(adjective, dead, tired, old, gray) | |
| prehistoric(adjective, ancient, oldness) | |
| fuddy-duddy(noun, new) | |
| square(noun, slang, new) | |
| fossilized | |
| hoary(tired, old, gray, mature, venerable) | |
| venerable(tired, old, gray, mature, early) | |
| mineral | |
| petrifaction(noun, verb, time, remains) | |
| reactionary |
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| APA | Smart Define. (2015). fossil thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/fossil/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "fossil thesaurus" https://smartdefine.org/fossil/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2015, fossil thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/fossil/thesaurus/synonyms>. |
| MLA | Smart Define. "fossil thesaurus" 14 April 2015. Web. 22 September 2026. <https://smartdefine.org/fossil/thesaurus/synonyms> |