unaccessible 

英汉解释

adj. 达不到的；难以接近的

同义词

a. inaccessible

反义词

a.   accessible

参考例句

1. Always unaccessible to touch sky.
永远飘不到天上。
2. Since the late fifties, about 40% of the Scrolls, mostly fragments from Cave 4, remained unpublished and were unaccessible.
自从五十年代后期以来，约40%的古卷，大部分来自洞4的碎片，尚未出版和无法整理。
3. On the other hand, the scheme splits the private key to make it unaccessible to the outside thus the security of the implementation of RSA algorithm is enhanced.
另一方面，方案采用密钥拆分机制，使得完整私钥对于外界是无法访问的，同时提高了RSA算法在实际应用中的安全性。

英英解释

adj.
  1. capable of being reached only with great difficulty or not at all

网络释义

unaccessible
难以接近; 难亲近的;