| old-fashioned(adjective, dead, past, lost, previous) | |
| old-time(adjective, dead, past, lost, previous) | |
| olden(adjective, dead, past, lost, previous) | |
| oldfangled(adjective, dead, past, lost, previous) | |
| omit | |
| one-time(adjective, dead, past, lost, previous) | |
| out-of-date(adjective, dead, past, lost, previous) | |
| overleap | |
| passed | |
| past recall | |
| prehistoric | |
| previous(adjective, dead, past, lost, former) | |
| primeval | |
| redeemed | |
| relented(verb, forgave) | |
| repressed(adjective, out) | |
| shriven | |
| slipped one's mind(adjective, out) | |
| sometime(adjective, dead, past, lost, previous) | |
| stark(adjective, desolate) |
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| APA | Smart Define. (2015). forgotten thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/forgotten/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "forgotten thesaurus" https://smartdefine.org/forgotten/thesaurus/synonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2015, forgotten thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/forgotten/thesaurus/synonyms>. |
| MLA | Smart Define. "forgotten thesaurus" 30 October 2015. Web. 23 September 2026. <https://smartdefine.org/forgotten/thesaurus/synonyms> |