mythomanian.
/ˌmɪθə(ʊ)ˈmeɪnɪə/, U.S. /ˌmɪθəˈmeɪniə/ An abnormal or pathological tendency or compulsion to create myths, exaggerate, or tell lies. Also: an obsession with myths and mythology.
ΘΚΠ
the mind > mental capacity > knowledge > conformity with what is known, truth > disregard for truth, falsehood > fabrication of statement or story > a false or foolish tale > [noun] > a fable, myth > habit of invention
mythomania1909
1909 Cent. Dict. Suppl. Mythomania.
1910 Amer. Jrnl. Med. Sci. 140 385 The case is, therefore, one of mythomania.
1928 W. M. Wheeler Foibles of Insects & Men Introd. p. xxv Those astonishing aberrations of mythomania, superstition and metaphysics from which the race has been suffering ever since it began to think.
1955 Antiquity 29 197 Deception for the mere fun of deceiving—a sort of mythomania.
1976 Telegraph (Brisbane) 20 May 18/2 A kind of mythomania has grown up about Brando.
1997 N.Y. Rev. Bks. 29 May 26/4 His singular magnetism was originally built on impudent lies, then further enriched by a permanent and compulsive mythomania.
This entry has been updated (OED Third Edition, June 2003; most recently modified version published online March 2022).
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n.1909