6
dated(adjective, original, old, outdated, obsolete)
6
medieval(adjective, old, oldness, having)
6
outdated(adjective, last, original, old, venerable)
6
outmoded(adjective, original, old, venerable, outdated)
6
stick-in-the-mud(noun, person, square, conventional, reactionary)
6
superannuated(adjective, original, dead, old, outdated)
5
aboriginal(adjective, last, original, past, primitive)
5
antebellum(oldness, the past)
5
old-time(adjective, new, last, original, primitive)
5
olden(adjective, new, original, old, primitive)
5
square(noun, person, conventional)
5
timeworn(adjective, new, prehistoric)
4
fogy
4
former(last, original, past, primitive, venerable)
4
jeff(noun, slang, conservative, traditionalist, dinosaur)
4
out of date
4
stale(adjective, original, old, outdated, obsolete)
4
traditional(feature, characteristic, detail, last, original)
3
Noachian
3
dodo
11 years ago|11k views|share |citing 
APASmart Define. (2015). antediluvian thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/antediluvian/thesaurus/synonyms
ChicagoSmart Define. 2015. "antediluvian thesaurus" https://smartdefine.org/antediluvian/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, antediluvian thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/antediluvian/thesaurus/synonyms>.
MLASmart Define. "antediluvian thesaurus" 14 April 2015. Web. 22 September 2026. <https://smartdefine.org/antediluvian/thesaurus/synonyms>