The Collaborative International Dictionary of English v.0.48:
Immobile \Im*mo"bile\, a. [L. immobilis: cf. F. immobile. See Immobility.] Incapable of being moved; immovable; fixed; stable. --Prof. Shedd. [1913 Webster] immobilisationWordNet (r) 3.0 (2006):
immobile adj 1: not capable of movement or of being moved [ant: mobile] 2: securely fixed in place; "the post was still firm after being hit by the car" [syn: fast, firm, immobile]