unlabelled

adj. 无标号的(未作标记的, 未分类的)

例句与用法：

The new teacher is still very much an unknown quantity but we have hopes that he will be a valuable member of our team.

新教师是谁现在还难以预料，但我们希望他会成为我们队里的重要一员。

The new sales director is still a bit of an unknown quantity.

新来的销售部主任大家还不大了解。