Bygone
Bygone adjective - No longer existing.
Forgotten
Forgotten adjective - Left unoccupied or unused.
Bygone is a synonym for forgotten in unremembered topic. You can use "Bygone" instead an adjective "Forgotten", if it concerns topics such as property. popular alternative
Mutual synonyms
Both words in one sentence
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Mephisto locks him in an enclosure in his lab where everything is made to look like a permanent 1996 (the episode aired in '99), and the mid-1990s are spoken of as a strange, bygone era, with extremely specific things from '96 apparently having already been forgotten.
Source: 20 Minutes into the Future
Cite this Source
Forgotten and Bygone. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/bygone/forgotten
Bygone & Forgotten. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/bygone/forgotten>.
Forgotten or Bygone. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/bygone/forgotten.
Google Ngram Viewer shows how "bygone" and "forgotten" have occurred on timeline