Main entry: immobile
Definition: not capable of movement or of being moved
Antonyms: mobile
Definition: moving or capable of moving readily (especially from place to place)
Antonyms: mobile
Definition: sculpture suspended in midair whose delicately balanced parts can be set in motion by air currents
Main entry: firm, fast, immobile
Definition: securely fixed in place
Usage: the post was still firm after being hit by the car
Antonyms: unfixed
Definition: not firmly placed or set or fastened