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braggart (n.)

"a boaster," 1570s, formerly also braggard, from French bragard (16c.), with pejorative ending (see -ard) + braguer "to flaunt, brag," perhaps originally "to show off clothes, especially breeches," from brague "breeches" (see bracket (n.)). There may be an element of codpiece-flaunting in all this.

Also as an adjective, "vain, boastful" (1610s). The word in English has been at least influenced by brag (v.), even if, as some claim, it is unrelated to it. Bragger "arrogant or boastful person," agent noun from brag (v.), is attested in English from late 14c. and has become practically a variant of this word.

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Definitions of braggart from WordNet
1
braggart (n.)
a very boastful and talkative person;
Synonyms: bragger / boaster / blowhard / line-shooter / vaunter
2
braggart (adj.)
exhibiting self-importance;
Synonyms: boastful / bragging / braggy / big / cock-a-hoop / crowing / self-aggrandizing / self-aggrandising
From wordnet.princeton.edu