mythomania; pathological lying
A clinical term for compulsive lying or a strong propensity to lie, often used in psychiatric contexts. The cross-referenced term 虚言癖 is more common in everyday language.
See also: 虚言癖
Patients with mythomania may tell lies without even realizing it themselves.
His stories were so exaggerated that people suspected he had mythomania.
Compound of 虚言 (kyogen, 'falsehood, lie') and 症 (shō, 'symptom, condition'). The term is a direct translation of the Western medical concept of mythomania.