The Adûnaic name for Númenor (Q. Númenórë), with the same meaning as its Quenya name: “Westernesse” (S/261). In The Silmarillion appendix, Christopher Tolkien stated that is it a loan word from Elvish (SA/andúnë). According to J.R.R. Tolkien’s own writing (SD/426), this is true, albeit not directly. Anadûnê is a feminized form of the adjective anadûni “western, of the west”, which is itself related to S. dûn “west”.
anadûnêplace name. Westernesse