 The Dwarves do not normally teach their language to others, so they learned both Quenya and Sindarin in order to communicate with the Elves, most notably the Noldor and Sindar.By the Third Age, however, the Dwarves were estranged from the Elves and no longer routinely learned their language.Instead, they both used the Westron or Common Speech, which was a Mannish tongue.