Definition of "immoveable"

From thence we came without the Eaſtern gate, (ſtanding on a low Banke, called the daughter of Syon, that over-toppeth the valley of Iehoſaphat,) unto an immoveable ſtone, upon the which they ſaid St. Stephen was ſtoned to death, the firſt Martyr of the Chriſtian faith; and the faithfull fore-runner of many noble followers.

1640, William Lithgow, “The Sixt Part”, in The Totall Diſcourſe, Of the rare Adventures, and painefull Peregrinations of long nineteene yeares Travailes from Scotland, to the moſt famous Kingdomes in Europe, Aſia, and Affrica […], London: I. Okes, page 249