Sedentary /(?)/

Sed·en·ta·ry

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.
    Any education that confined itself to sedentary pursuits was essentially imperfect.
    — Beaconsfield.
  3. Inactive; motionless; sluggish; hence, calm; tranquil. [R.]
    The soul, considered abstractly from its passions, is of a remiss, sedentary nature.
    — Spectator.
  4. Caused by long sitting. [Obs.]
  5. Remaining in one place, especially when firmly attached to some object; as, the oyster is a sedentary mollusk; the barnacles are sedentary crustaceans. (Zool.)

Phrases & Compounds
Sedentary spider
one of a tribe of spiders which rest motionless until their prey is caught in their web.