• brag, braggart, bravado, fire-eater, flaunting, flaunty, gassy, hectoring, magniloquent, ostentatious, vainglorious
• bluster, boast, bounce, brag, braggart, crack, cracker, magniloquence, show-off, side, swagger, vaingloriousness, vainglory, vaunt
• it does not behove him to boast