Following the Akallabêth, the surviving Elendili who established the kingdoms of Arnor and Gondor shunned Adûnaic in favour of Sindarin due to the associations of the former with the tyrannical Ar-Pharazôn and his followers the King's Men.
Also, at the end of The Silmarillion, "Akallabêth", or 'the falling of a star,' recounts the fall of Númenor and its kings, and also the rise of Gondor and Arnor.