tendinous

运动员感到膝盖附近有疼痛，可能是肌腱组织发炎了。

The athlete felt pain near the knee, possibly due to inflamed ___tendinous tissue.

长时间缺乏运动后，他的手臂肌肉变得像肌腱一样坚硬。

After prolonged inactivity, the muscles in his arms became ___tendinous and stiff.