immobile
1. [ adjective ] not capable of movement or of being moved
Related terms: mobile stiff nonmotile immovable nonmoving
2. [ adjective ] securely fixed in place
Synonyms: firm fast
Examples:

"the post was still firm after being hit by the car"

Related terms: fixed
Similar spelling:   immobilize
  immobilise
  immobility
  impolite
  impolitely