128 entries under adjective topic. ×

6
exanimate(dull, cold, dead, late)
6
extinguished(dead, obsolete)
6
nonexistent(real, fictional)
5
asleep(dead, lifeless, late, live)
5
cold(dull, informal, dead, lifeless)
5
disappeared(split, quit, dead, lost)
5
dormant
5
no more(expression, idiom, split, lifeless)
5
out of date(expression, idiom)
5
outworn(dead, odd, out, old)
5
terminated(dead, obsolete)
4
irrecoverable(forgotten, the past)
4
old hat
4
superseded(dead, obsolete)
3
disused
3
done for(dead, obsolete)
3
exterminated(dead, obsolete)
3
gone by(verb, expression, phrasal verb, dead)
3
inert(lifeless, late, asleep, nonliving)
2
at rest(expression, idiom, live)
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APASmart Define. (2016). extinct thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/extinct/thesaurus/synonyms
ChicagoSmart Define. 2016. "extinct thesaurus" https://smartdefine.org/extinct/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2016, extinct thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/extinct/thesaurus/synonyms>.
MLASmart Define. "extinct thesaurus" 10 February 2016. Web. 22 September 2026. <https://smartdefine.org/extinct/thesaurus/synonyms>