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Adjective: unwritten  ,ún'ri-t(u)n
  1. Using speech rather than writing
    "an unwritten tradition";
    - oral
  2. Said or done without having been planned or written in advance
    "he made a few unwritten remarks";
    - ad-lib, spontaneous
  3. Based on custom rather than documentation
    "an unwritten law"; " ancient that they well might have had their unwritten origins in Aurignacian times"

See also: common-law, spoken, unscripted

Antonym: written

Encyclopedia: Unwritten