Immovable, a.
1. Incapable of being moved; firmly fixed; fast; -- used of material things; as, an immovable foundatin. Immovable, infixed, and frozen round. Milton.
2. Steadfast; fixed; unalterable; unchangeable; -- used of the mind or will; as, an immovable purpose, or a man who remain immovable.
3. Not capable of being affected or moved in feeling or by sympathy; unimpressible; impassive. Dryden.
4. (Law.)
1 more senses
Not liable to be removed; permanent in place or tenure; fixed; as, an immovable estate. See Immovable, n. Blackstone. Immovable apparatus (Med.), an appliance, like the plaster of paris bandage, which keeps fractured parts firmly in place. -- Immovable feasts (Eccl.), feasts which occur on a certain day of the year and do not depend on the date of Easter; as, Christmas, the Epiphany, etc.
1 other Webster entry under this spelling
Immovable, n.
1. That which can not be moved.
2. pl. (Civil Law)
Lands and things adherent thereto by nature, as trees; by the hand of man, as buildings and their accessories; by their destination, as seeds, plants, manure, etc.; or by the objects to which they are applied, as servitudes. Ayliffe. Bouvier.
Shades of meaning
Fernald has no entry of its own for immovable; he lists it under obstinate.
He lists it without comment; the entries above explain its neighbors.