9
ossified(adjective, hardened, frozen, petrified)
7
fossilised(verb, adjective, bent, unfashionable, outdated)
5
fossil
5
petrified(adjective, hardened, syrupy, jellied, cimmerian)
4
antiquated
4
calcified(verb, adjective, hardened, syrupy, jellied)
4
fossilize(verb, close, set, fix, firm)
3
archaic
3
hardened(verb, adjective, petrified)
3
moth-eaten(adjective, tired, bent, unfashionable, obsolete)
3
solidified
3
superannuated
2
ancient
2
antediluvian(adjective, tired, bent, unfashionable, obsolete)
2
callous(verb, close, set, fix, firm)
2
calloused(verb, jellied, gel, calcify, coagulate)
2
case-hardened(verb, calcify, curdled, calloused, densify)
2
indurate(verb, close, set, fix, firm)
2
medieval
2
old-world
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APASmart Define. (2015). fossilized thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/fossilized/thesaurus/synonyms
ChicagoSmart Define. 2015. "fossilized thesaurus" https://smartdefine.org/fossilized/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, fossilized thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/fossilized/thesaurus/synonyms>.
MLASmart Define. "fossilized thesaurus" 14 April 2015. Web. 22 September 2026. <https://smartdefine.org/fossilized/thesaurus/synonyms>