DICT.TW Dictionary Taiwan

 unwritten law
 不成文法,習慣法

 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.
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 unwritten law
      n : law based on customary behavior