braggadocious

adjective

brag·​ga·​do·​cious ˌbra-gə-ˈdō-shəs 

: characterized by bold or brash self-confidence : having or displaying braggadocio : boastful, cocky

… braggadocious flaunting of his Maserati sports car …

—Kai Arne Hansen

… confident lyrics that ooze both feminine mystique and braggadocious swagger.

—J'Na Jefferson

When I was in high school, I walked around like I was the best. … He told me to be braggadocious. He instilled this confidence in me and got the best out of me.

—Cam Saddler, quoted in The Pittsburgh Post-Gazette

braggadociously adverb

He braggadociously claimed he believes he can lead the program to the College Football Playoff.

—Sam Blum

Word History

Etymology

braggadocio + -ous, after derivatives with -ous of Latin adjectives ending in -ōc-, -ōx, as atrocious, ferocious

First Known Use

1853, in the meaning defined above