Pronunciation of Adûnaic changed rapidly during its time. Since the phrases and names are given in the Late Adûnaic, this pronunciation guide focuses on that.
(A/Â) Pronounce them /a/, in the back of your throat, like the A is in the word “father”.
(Ê) Pronounce them /e:/, in the middle of your mouth. It sounds like the E of “eight”.
(I/Î) Pronounce them /i/, in the front of your mouth, as in the word “machine”.
(Ô) Pronounce them /o:/ as in the word “boat”.
(U/Û) Pronounce them /u/ as in “brute”, in the front of your mouth. Make your lips in the shape of a kiss.
*The circumflex accents on vowels denote extra length on the vowels. Hold the vowels longer. In music this is shown with a tenuto (-) over the note. In IPA, the circumflex accent would be shown with (:).
(ÂI) Pronounce this /a:i/, as in the word “twine”, except with the A held for a longer time.
(ÂU) Pronounce this /a:u/, as in the word “loud”, except with the A held for a longer time.
(ÔI) Pronounce this /o:i/, as in the word “boy“, except with the O held for a longer time.
(ÊU) Pronounce this /e:u/, a long E, then a short U.
(KH) Pronounce it /x/, as in the name “Bach“. Say it in the back of your mouth, it should feel a little as though you are hocking a loogy, or gargling without anything in your mouth.
(L) Always pronounce it as a /l/, as in the word “lear”, never like the L in “bull“.
(NG/NK) Pronounce the N /ŋ/, as in the word “finger” or “thinker”.
(PH) Pronounce it /ɸ/, basically an F, but pronounced with your lips pursed, instead of your lower lip pressed against your upper front teeth.
(R) Pronounce it as an /r/; roll it as we sometimes do in the word “growl” If you can’t roll an R, like me, make an H sound with your throat closed a little. It should make a rolled A sound. It’ll be a little like gargling water.
(TH) Pronounce it /θ/, as in the word “nothing”.
(KKH) Pronounce it /xx/, ending one syllable and starting the next one.
(PPH) Pronounce it /ɸɸ/, ending one syllable and starting the next one.
(TTH) Pronounce it /θθ/, ending one syllable and starting the next one.
(PTH/PHD/PHT) Pronounce it /ɸθ/, ending one syllable and starting the next one.
(KTH) Pronounce it /xθ/, ending one syllable and starting the next one.
The rest of the letters are pronounced as we pronounce them in English.
The Lord of the Rings (The Return of the King) – Appendix E
Sauron Defeated – The Drowning of Andûnê – Adunaic