a.

1. 坐着的；需要（或惯于）久坐不动的
   To maintain a sedentary posture over a long period is detrimental to your health.

   长时间静坐的姿势对身体是有害的。

   I'm bored with sedentary work.

   我对坐着做的工作已经腻了。

2. （鸟等）定栖的；（贝壳）固定附着的

adj.

1. tending to spend much time seated.
   ▸(of work or a way of life) characterized by much sitting and little physical exercise.
   ▸sitting.
2. Zoology  & Anthropology  inhabiting the same locality throughout life.
3. Zoology  sessile.