Stiffness can usually be eased with heat or a warm bath.热敷或热水澡通常可以缓解肌肉僵硬。

the painful stiffness in my right shoulder我右肩酸痛僵硬的感觉

There had been stiffness and long silences.气氛有时会拘谨局促, 半天没人说话。