23
perished(adjective, feature, state, dead, death)
22
annihilated(adjective, feature, state, dead, death)
22
vanished(adjective, split, quit, new, dead)
19
parted(adjective, feature, state, dead, death)
18
fatal(adjective, feature, state, dead, death)
16
out(adjective, adverb, dead, odd, old)
16
lost(verb, adjective, split, quit, new)
14
lifeless(adjective, dead, late, live, living)
13
expired(adjective, feature, state, characteristic, trait)
12
bygone(adjective, dead, odd, out, old)
10
late(adjective, dead, lifeless, live, unresponsive)
8
past(adjective, split, quit, dead, odd)
7
inactive(adjective, dull, cold, dead, tired)
7
antediluvian(adjective, dead, out, unfashionable, antiquated)
7
ended(adjective, split, dead, away, lacking)
7
inanimate(adjective, dead, lifeless, late, death)
7
nonextant(adjective, split, away, lacking, finished)
7
over(split, away, lacking, finished, absent)
6
ancient(adjective, dead, odd, out, old)
6
elapsed(adjective, split, away, lacking, finished)
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APASmart Define. (2016). extinct thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/extinct/thesaurus/synonyms
ChicagoSmart Define. 2016. "extinct thesaurus" https://smartdefine.org/extinct/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2016, extinct thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/extinct/thesaurus/synonyms>.
MLASmart Define. "extinct thesaurus" 10 February 2016. Web. 20 September 2026. <https://smartdefine.org/extinct/thesaurus/synonyms>