Thrasonical

a. [ From Thrso, the name of a braggart soldier in Terence's “Eunuch:” cf. L. Thrasonianus. ] Of or pertaining to Thraso; like, or becoming to, Thraso; bragging; boastful; vainglorious. -- Thra*son"ic*al*ly, adv. [1913 Webster]

Caesar's thrasonical brag of 'I came, saw, and overcame.' Shak. [1913 Webster]