15
antique(noun, adjective, ancient)
9
antediluvian(adjective, ancient, oldness)
8
trace(noun, verb, time, remains)
7
dodo
7
fogy(noun, new, square)
7
archaic(adjective, ancient, oldness)
7
relic(noun, verb, time, remains)
7
antiquated
6
fogey
6
impression(noun, verb, time, remains)
5
ancient(adjective, dead, tired, old, gray)
5
prehistoric(adjective, ancient, oldness)
4
fuddy-duddy(noun, new)
4
square(noun, slang, new)
4
fossilized
4
hoary(tired, old, gray, mature, venerable)
4
venerable(tired, old, gray, mature, early)
4
mineral
4
petrifaction(noun, verb, time, remains)
4
reactionary
<1234510>
11 years ago|6k views|share |citing 
APASmart Define. (2015). fossil thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/fossil/thesaurus/synonyms
ChicagoSmart Define. 2015. "fossil thesaurus" https://smartdefine.org/fossil/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, fossil thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/fossil/thesaurus/synonyms>.
MLASmart Define. "fossil thesaurus" 14 April 2015. Web. 22 September 2026. <https://smartdefine.org/fossil/thesaurus/synonyms>