non-extant
adjective
formal(alsononextant)uk/ˌnɒn.ekˈstænt//ˌnɒnˈek.stənt/us/ˌnɑːn.ekˈstænt//ˌnɑːnˈek.stənt/veryoldand nolongerexisting:
There are anumberof non-extantplaysthat weknowwere written by theplaywright.
Reference is made to a non-extantletterfrom the 15thcentury.
- Thesecrettounderstandingwhy thetowerwasconstructedmayliein a non-extantpapyrusfrom around 1100 BC.
 - It isbelievedthat some nonextantspeciesmay have beenamphibious.
 - His earlyworksaresadlyall non-extant,causingscholarstospeculateontheirsubjectmatter.
 
Non-existence and not being
- absence
 - absent
 - aren't
 - defunct
 - die
 - die out
 - extinct
 - extinguishment
 - isn't
 - negation
 - non-body
 - non-existent
 - nonexistential
 - nothingness
 - seronegative
 - such
 - there's no such thing/person (as)idiom
 - unfulfilled
 - vanished
 - void