Synonyms of unwritten

Adjective

1. unwritten (vs. written), common-law(predicate)

usage: based on custom rather than documentation; "an unwritten law"; "rites...so ancient that they well might have had their unwritten origins in Aurignacian times"- J.L.T.C.Spence

2. oral, unwritten, spoken (vs. written)

usage: using speech rather than writing; "an oral tradition"; "an oral agreement"

3. ad-lib, spontaneous, unwritten, unscripted (vs. scripted)

usage: said or done without having been planned or written in advance; "he made a few ad-lib remarks"

Definition and meaning of unwritten (Dictionary)