unwritten

From Middle English unwriten, from Old English unwriten, unġewriten (“unwritten”), equivalent to un- +‎ written.

unwritten (not comparable)

1. Not written.
2. Oral or otherwise communicated without writing.
3. Implicit or understood but not formally articulated.

   It's an unwritten rule that you lock the gate when you leave the swimming pool.

4. Containing no writing; blank.

   unwritten paper

unwritten

1. past participle of unwrite

• unwrittenness
• written
• de facto
• oral