rusty /ˈrʌsti/

adj. 生锈的，生疏的，荒废的

It means that the skill that you have or your knowledge of something is not as good as it used to be, because you have not used it for a long time; or means that sth. Is covered with rust on the surface.

它指的是你所拥有的技能或你对某事的知识因久未使用，而较之以前生疏了;或指的是某物表面上生锈了。

Tom hasn't played basketball for a long time, so he is a little rusty this time.

Tom有一段时间没有打篮球了，所以这次有点生疏。

Though his car is rusty, he was still reluctant to buy a new one.

尽管他的车生锈了，但他还是舍不得买辆新的。