Pathological liars, know how to be confident while lying and use their pathological lying trait as a defense mechanism (e.g., they fix their gaze upon you rather than looking away).
Pathological liars can be very manipulative and generally lie to get their way. They have little to no regard for whom they hurt. Their lies are usually very dramatic, complicated, and detailed.
Unlike the compulsive liar, who generally knows right from wrong, a pathological liar lives with a false sense of reality. If confronted, they become defensive and never admit their lies.