im·mo·bile 
(ĭ-mōbəl, -bēl′, -bīl′)
(ĭ-mōbəl, -bēl′, -bīl′)adj.
1. Immovable; fixed: an immobile rock formation.
2. Not moving; motionless: The patient in the coma was immobile.
3. Not very mobile or agile; capable of moving only slowly: an immobile quarterback.
im′mo·bili·ty (-bĭlĭ-tē) n.