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. Etym: [Cf. L. lex non scripta.] That part of the law of England and of the United States which is not derived from express legislative en...