jactanciosa

adj. boastful, arrogant, proud

n. boaster, braggart

adj. vainglorious, magniloquent; windy

= boastful, show-off, showboat, hot dog.
Ex: The main character displays a boastful attitude that smacks of hubris in the extreme.
Ex: The ebullient Mr Wang is a chatterbox and a bit of a show-off.
Ex: Steve knows that he is a 'showboat, a little bit of a prick,' but he also knows that it's too late for a man in his fifties to change.
Ex: Jerry Hairston is a bit of a hot dog and needs to be reined in at times.