Well: we probably do not know the languages because, like everyone else said, the Dwarves were very secretive, and most who were not dwarves did not know the languages. We, being Elves, Men, or Hobbits (mostly, there are a few exceptions: I have met some Dwarves on here), do not know the language because the Dwarves keep their lives, real names, and languages mostly secret, unless you are a special friend of the Dwarves.
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"I think we dream so we don't have to be apart so long. If we're in each others dreams, we can be together all the time." - Hobbes of Calvin and Hobbes
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