There are no simple answers to questions like these. Human nature is subject to almost infinite variety and circumstances can bring out the worst behavior in any identifiable group. That said, to the untrained person a lawyer doing his or her job of advocating may often appear to the opposing party to be a liar. There is a profound difference between vigorous advocacy and lying but most lawyers understand that disagreements about the line between those two activities are inevitable.
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Lawyers are one of the few professionals who will lose their license to practice if they lie.
That said, no one has to agree that your side of the story is the truth.