Webster's Revised Unabridged Dictionary · 1913

Thrasonical

Thrasonical , adjective

[From Thrso, the name of a braggart soldier in Terence's “Eunuch:” compare Latin Thrasonianus.]

Of or pertaining to Thraso; like, or becoming to, Thraso; bragging; boastful; vainglorious.
Eunuch:
Caesar's thrasonical brag of 'I came, saw, and overcame.' — Shakespeare