资料来源 : pyDict

没有写的,没有记录的,口头的

资料来源 : Webster's Revised Unabridged Dictionary (1913)

Unwritten \Un*writ"ten\, a.
   1. Not written; not reduced to writing; oral; as, unwritten
      agreements.

   2. Containing no writing; blank; as, unwritten paper.

   {Unwritten doctrines} (Theol.), such doctrines as have been
      handed down by word of mouth; oral or traditional
      doctrines.

   {Unwritten law}. [Cf. L. lex non scripta.] That part of the
      law of England and of the United States which is not
      derived from express legislative enactment, or at least
      from any enactment now extant and in force as such. This
      law is now generally contained in the reports of judicial
      decisions. See {Common law}, under {Common}.

   {Unwritten laws}, such laws as have been handed down by
      tradition or in song. Such were the laws of the early
      nations of Europe.

资料来源 : WordNet®

unwritten
     adj 1: 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 [ant: {written}]
     2: using speech rather than writing; "an oral tradition"; "an
        oral agreement" [syn: {oral}]
     3: said or done without having been planned or written in
        advance; "he made a few ad-lib remarks" [syn: {ad-lib}, {spontaneous}]