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.
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