(adj.) 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 .
校对:索尼亚
双语例句
His Saturday half-holiday he spent in the wood with his book of fairy legends, and that other unwritten book of his imagination. 夏洛蒂·勃朗特.雪莉.