Where does it claim that Adunaic is no longer spoken by the Dunedain?

[Galrohad]

Where does it claim that Adunaic is no longer spoken by the Dunedain? Someone pointed to a writing by Christopher Tolkien but I can no longer find it.

 

[Thorondor_]

It might be in refference to The Atani and their languages, HoME XII:

The ancient Adunaic of Numenor became worn down by time - and by neglect. For owing to the disastrous history of Numenor it was no longer held in honour by the 'Faithful' who controlled all the Shorelands from Lune to Pelargir. For the Elvish tongues were proscribed by the rebel Kings, and Adunaic alone was permitted to be used, and many of the ancient books in Quenya or in Sindarin were destroyed. The Faithful, therefore, used Sindarin, and in that tongue devised all names of places that they gave anew in-Middle-earth. Adunaic was abandoned to unheeded change and corruption as the language of daily life, and the only tongue of the unlettered. All men of high lineage and all those who were taught to read and write used Sindarin, even as a daily tongue among themselves. In some families, it is said, Sindarin became the native tongue, and the vulgar tongue of Adunaic origin was only learned casually as it was needed.(

 

[Galrohad]

I have been absent for many months but will be active now. Thank you for the reply Thorondor. I had been a registered user several years ago and I brought up this same question and was given references to where Christopher Tolkien said that Adunaic was no longer used and its use was actually frowned upon. I have searched for these references and can not find them in any of the books I have come across. If anyone knows where to find these references I would very much appreciate direction to them.