- extinct, nonextant - no longer in existence; lost or especially having died out leaving no living representatives; "an extinct species of fish"; "an extinct royal family"; "extinct laws and customs"
- nonextant - no longer existing or inaccessible through loss or destruction; "its nonextant original was written on vellum"- G.B.Saul
Antonyms: existent, existing (indirect, via nonexistent)