bragging, cocky, conceited, crowing, egotistical, full of oneself, puffed-up, swaggering, swanky (informal) swollen-headed, vainglorious, vaunting
deprecating, humble, modest, self-belittling, self-effacing, unassuming
English Collins Dictionary - English synonyms & Thesaurus
If someone is boastful, they talk too proudly about something that they have done or that they own. adj
I'm not being boastful., ...boastful predictions.
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