adjective
characterized by boasting or bragging; proud or self-important
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The CEO's boastful claims about the company's success were met with skepticism by the shareholders.
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He's always so boastful about his golf game, but I've never seen him actually play.
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She's so full of herself, always being all boastful and stuff.
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His boastful attitude is like a shield, hiding his insecurities underneath.