unwritten

adj not written down 未写下的; 不成文的. an unwritten law/`rule law/rule that is based on custom and practice, but is not written down 不成文法[规定].

unwelcome, unwholesome, unwieldiness, unwieldy, unwilling, unwillingly, unwillingness, unwind, unwise, unwisely, unwitting, unwittingly, unwonted, unworkable, unworldliness, unworldly, unworthily, unworthiness, unworthy, unwound, unyielding, up, up and doing, up and down, up in arms, up to, up to date, up to time, up-, up-and-coming, up-country, up-end, up-market, up-to-date, up-to-the-minute, upbeat, upbraid, upbringing, upcreep, update,