26 entries under oldness topic. ×

15
antediluvian(adjective, antiquated, before)
13
primeval(adjective, original, fixed, primitive, early)
12
archaic(adjective, old, early, antique, antiquated)
12
primitive(adjective, original, old, past, ancient)
11
primordial(adjective, original, primitive, early, antique)
4
aboriginal
4
fossil
3
antebellum
3
medieval
3
patriarchal
2
ancestral
2
preadamite
2
preglacial
2
prime
2
protohistoric
1
antemundane
1
classic
1
colonial
0
beginning
0
black-letter
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APASmart Define. (2016). prehistoric thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/prehistoric/thesaurus/synonyms
ChicagoSmart Define. 2016. "prehistoric thesaurus" https://smartdefine.org/prehistoric/thesaurus/synonyms (accessed September 26, 2026).
HarvardSmart Define 2016, prehistoric thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/prehistoric/thesaurus/synonyms>.
MLASmart Define. "prehistoric thesaurus" 29 February 2016. Web. 26 September 2026. <https://smartdefine.org/prehistoric/thesaurus/synonyms>