unwritten

(un rit'n, unrit′'n)

adjective

  1. not in writing; not written or printed
  2. operating only through custom or tradition: an unwritten rule
  3. not written on; blank

See unwritten in American Heritage Dictionary 4

adjective
  1. Not written or recorded: an unwritten agreement between friends.
  2. Having authority based on custom, tradition, or usage rather than documentation: an unwritten law.
  3. Not written on; blank.

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