Pathological liar is someone who compulsively tells lies, sometimes with no apparent reason. Other terms used to describe pathological liars include mythomaniac, fabulist, and pseudologue. Mythomaniac refers to someone who is characterized by the creation of myths or false stories about themselves. Fabulist describes someone who habitually tells lies or invents imaginary stories. Pseudologue, on the other hand, refers to someone who engages in prolonged, false storytelling. Other terms used to describe pathological liars are compulsive liar, chronic liar, and habitual liar. In any case, the underlying trait of a pathological liar is the need to deceive others, often to an extent that it becomes a problem for them and others around them.