I would have said Sauron, but since the question was specifically about LOTR, I voted Wormtongue. Sauron's lying ended in the 2nd age; from the beginning of the 3rd, everyone knew he was downright evil. He was a mighty big liar in the 1st and 2nd ages, though, but not in LOTR.
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You passed from under darkened dome, you enter now the secret land. - Take me to Finrod's fabled home!... ~ Finrod: The Rock Opera
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