| forgotten(adjective, dead, past, lost, previous) | |
| exanimate(adjective, dull, cold, dead, late) | |
| extinguished(adjective, dead, obsolete) | |
| nonexistent(adjective, real, fictional) | |
| asleep(adjective, dead, lifeless, late, live) | |
| cold(adjective, dull, informal, dead, lifeless) | |
| disappeared(adjective, split, quit, dead, lost) | |
| dormant | |
| lapsed(past, the past) | |
| no more(expression, adjective, idiom, split, lifeless) | |
| out of date(expression, adjective, idiom) | |
| outworn(adjective, dead, odd, out, old) | |
| terminated(adjective, dead, obsolete) | |
| exploded | |
| irrecoverable(adjective, forgotten, the past) | |
| old hat | |
| quenched | |
| superseded(adjective, dead, obsolete) | |
| disused | |
| done for(adjective, dead, obsolete) |
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| APA | Smart Define. (2016). extinct thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/extinct/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "extinct thesaurus" https://smartdefine.org/extinct/thesaurus/synonyms (accessed September 20, 2026). |
| Harvard | Smart Define 2016, extinct thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/extinct/thesaurus/synonyms>. |
| MLA | Smart Define. "extinct thesaurus" 10 February 2016. Web. 20 September 2026. <https://smartdefine.org/extinct/thesaurus/synonyms> |