adj (1) 不(未)知的，不理解的(not within the range of knowledge， experience， or understanding)[A(to)]：an～man/helper 陌生人/的协助者;～forces 不为人所知的军事力量;The cause(of the delay)/driver(of the car) is as yet～.不知道(推迟的)原因/(汽车)驾驶员是谁。(passages sb is quoting/side-effects of the drug) be～to people 人们并不熟悉(某人引用的文章/药物的副作用);an～quantity 未知量;难以预测的人或事;

unknown to sb 未被……知晓：Quite～to me， she was on a plane to New York/had gone ahead and booked the holiday. 在我浑然不知的情况下她登上了飞往纽约的飞机/前去登记度假。 〖同〗unfamiliar，strange;〖反〗known，familiar，identified;

(2)不知(出)名的，无名的(not well-known or famous)：an～singer/actor/star of the film 不知名的歌手/演员/影星;the tomb of the～warrior/soldier 无名战士墓;〖同〗unfamiliar;〖反〗well-known，famous;

← know v;

→ ͵un′knownness n 不知道;不闻名;

n (1) 未知地点(事物)(place， thing， etc that is not known)[C，the～]：a journey into the～深入尚不为人所知的地区旅行;fear of the～对未知事物的恐惧;

(2)不知名的人(person who is little known)[C]：The leading role is played by a complete～. 领衔主演的是一个根本不出名的演员。

(3)未知数(symbol in a mathematical equation representing an unknown quantity)[C]：Let X be the～in this equation. 设X为这个等式的未知数。X and Y are～s. X与Y为未知数。