nonextant

英[nɒneks'tænt] 美[nɒneks'tænt]
  • adj.灭绝的;消失的
Adjective:
  1. 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"

  2. no longer existing or inaccessible through loss or destruction;

    "its nonextant original was written on vellum"