boastfully
Definitions
In a manner that shows excessive pride and self-satisfaction regarding one's achievements, possessions, or abilities.
With an arrogant or bragging tone intended to impress others.
Examples
He spoke boastfully about his recent promotion to the entire office.
The young athlete boasted boastfully that he would win the gold medal without any effort.
Synonyms
arrogantly braggartly vaingloriously pompously swaggeringly cockily pretentiously
Antonyms
humbly modestly meekly unassumingly diffidently quietly reservedly