Etymology
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immobile (adj.)

mid-14c., originally of property; by c. 1400 "steadfast, unmovable" (of faith, etc.), from Old French immoble "immovable, fixed, motionless" (13c., Modern French immeuble), from Latin immobilis "immovable" (also, figuratively, "hard-hearted"), from assimilated form of in- "not, opposite of" (see in- (1)) + mobilis (see mobile (adj.)). Related: Immobilism "policy of extreme conservatism" (1853).

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Definitions of immobile

immobile (adj.)
not capable of movement or of being moved;
immobile (adj.)
securely fixed in place;
Synonyms: fast / firm
From wordnet.princeton.edu