这个旧门把手相当僵硬，很难转动。

The old door handle is rather ___stiff and hard to turn.

以一个别扭的姿势睡觉后，我的脖子在早上感觉僵硬。

After sleeping in an awkward position, my neck felt ___stiff in the morning.

缺乏锻炼会使你的肌肉变得僵硬。

Lack of exercise can make your muscles become ___stiff.