20
old(adjective, new, traditional, outdated, obsolete)
15
old-fashioned(adjective, past, up-to-date, antiquated)
13
traditional
11
vintage
10
ancient
7
past
6
archaic
6
dated
5
asynchronous
4
antediluvian
4
antiquated
4
bygone
4
former
4
late
4
legacy(feature, characteristic, state, computing)
4
noncurrent
3
future
3
kaput
3
old-world
3
outmoded
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APASmart Define. (2016). contemporary thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/contemporary/thesaurus/antonyms
ChicagoSmart Define. 2016. "contemporary thesaurus" https://smartdefine.org/contemporary/thesaurus/antonyms (accessed September 24, 2026).
HarvardSmart Define 2016, contemporary thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/contemporary/thesaurus/antonyms>.
MLASmart Define. "contemporary thesaurus" 29 March 2016. Web. 24 September 2026. <https://smartdefine.org/contemporary/thesaurus/antonyms>