Source : Webster's Revised Unabridged Dictionary (1913)

Thrasonical \Thra*son"ic*al\, 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.

         C[ae]sar's thrasonical brag of 'I came, saw, and
         overcame.'                               --Shak.