Adunaic
The Mannish tongue of the Númenóreans
Dates: First called Adunaic in the early Second Age.
There is no record of its use after the Downfall in II 33191
Persisted in common use for some 3,300 years
Origins: Evolved from the old tongue used by the Men of the House of Hador
Race: Men
Division: Númenóreans
Pronunciation: Uncertain2
Meaning: '(Language of the) West'
Other Names: Númenórean
The native tongue of the Númenóreans, the ancestral language of Westron.
Notes
1 Though the name Adunaic cannot have been used before the Edain travelled to Númenor at the beginning of the Second Age, the language itself, or something very close to it, seems to have been spoken in Beleriand during the First Age, at least by the people of the House of Hador. While there is no mention of its use after the Downfall, it cannot have become completely extinct at this date; it seems likely that the scholars of Gondor and of Arnor would have been familiar with the ancient tongue of their ancestors, but in general use Adûnaic was replaced by the Westron (which had developed from it) and Elvish languages.
2 Following the conventions of Elvish pronunciation, the word would be pronounced a'doon-ike. Adûnaic is not an Elvish word, though, and is in fact so clearly modelled on real linguistic terms such as Hebraic or Aramaic that a pronunciation based on these, a'doon-ayik, seems somewhat more plausible.