pathological liar

(psychology) A person who tells lies frequently and compulsively.

Japanese Meaning

病的なくらい頻繁に嘘をつく人 / 衝動的かつ常習的に虚偽を述べる人物 / 心理学的には、嘘を常習的に、かつ制御が困難な状態でつく人

After his third contradictory story, everyone realized he was a pathological liar and stopped asking him for details.

彼が3回目の矛盾した話をした後、誰もが彼が虚言癖のある人だと気づき、詳細を尋ねるのをやめた。

Sense（1）

(psychology) A person who tells lies frequently and compulsively.

pathological liars

（ plural ）