我的德语相当生疏了，因为我好几年没练习了。

My German is quite ___rusty since I haven't practiced in years.

我的莫尔斯电码有点生疏了，需要复习一下那些信号。

I'm a bit ___rusty with Morse code and need to review the signals.

休息了整个冬天后，他的网球技术生疏了。

His tennis skills are ___rusty after taking the whole winter off.