A noun meaning “west(ward)” (SD/435, PE17/18). Tolkien stated that was “a loan word from Eldarin speech in the language of
the Folk of Hador, from which Númenórean was later derived” (PE17/18). Probably it is derived from S.
dûn “west”, as suggested by several authors (
AAD/9,
EotAL/NDU). Tolkien stated that it was an adjective and its proper noun form was
adûni (SD/435), but
adûn was used as a noun in phrases such as
Bârîm an-adûn “Lords of the West” (SD/247).