not recorded in writing 未写下的;无文字记录的 documenting unwritten languages. 记录无文字语言。 ■(especially of a law) resting originally on custom or judicial decision rather than on statute (尤指法律)未成文的 an unwritten constitution. 未成文宪法。 ■(of a convention) understood and accepted by everyone, although not formally established 惯例的,因袭的 the unwritten rules of social life. 社会生活中的不成文规定。