nonextant

adjectives

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"
no longer existing or inaccessible through loss or destruction
"its nonextant original was written on vellum"- G.B.Saul
is similar to
not having existence or being or actuality
"chimeras are nonexistent"