mythomane
[mith-uh-meyn]
noun
a person with a strong or irresistible propensity for fantasizing, lying, or exaggerating.
adjective
of, relating to, or characteristic of a mythomane.
Origin of mythomane
First recorded in 1950–55; perhaps back formation from mythomania
Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019