未授权的英文：
unauthorized; undelegated

Some students were using their computers to goof off or visit unauthorized websites.
一些学生曾经用电脑访问未授权网站来打发时间。

Damages due to misuse and unauthorized modification of hardware.
人为因素造成之故障、损坏或改装。

No unauthorized person is allowed in the room while the examination is in progress.
当考试进行时，未经许可者不得入内。

Unchecked (unauthorized) flow of population (from the countryside to the cities)
盲流人口

Failures to prohibit unauthorized departmental coffers repeatedly.
各种“小金库”屡禁不止。

Unauthorized emails are treated as junk after a period of time.
未被授权的电子邮件时间的时期如垃圾邮件被对待。