Etymology
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unwritten (adj.)

mid-14c., from un- (1) "not" + past participle of write (v.). Similar formation in Old English unwriten, Old Norse uritinn.

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Definitions of unwritten

unwritten (adj.)
based on custom rather than documentation; "rites...so ancient that they well might have had their unwritten origins in Aurignacian times"- J.L.T.C.Spence;
an unwritten law
unwritten (adj.)
using speech rather than writing;
Synonyms: oral
unwritten (adj.)
said or done without having been planned or written in advance;
Synonyms: ad-lib / spontaneous
From wordnet.princeton.edu