Sedentary

a.
  1. Accustomed to sit much or long; as, a sedentary man.
  2. Characterized by, or requiring, much sitting; as, a sedentary employment; a sedentary life.
  3. Inactive; motionless; sluggish; hence, calm; tranquil.
  4. Caused by long sitting.
  5. (Zoöl.) Remaining in one place, especially when firmly attached to some object; as, the oyster is a sedentary mollusk; the barnacles are sedentary crustaceans.
    6. Sedentary spider (Zoöl.),
    one of a tribe of spiders which rest motionless until their prey is caught in their web.