rusty
adj (-ier, -iest)
1 affected with rust 生锈的; 锈蚀的; 生锈病的: rusty nails 生锈的钉子.
2 [esp pred 尤作表语]
(fig 比喻) of a poor quality or standard through lack of practice （因缺乏实践）质量或标准下降; 荒疏
My German, tennis, singing is rather rusty. 我久未练习, 德语、 网球、 唱歌水平低了很多.