Being boastful is a behavior that involves bragging and talking about oneself in an overly positive way. VAUNT, BRAG, CROW, Talkbig, and Tootyourownhorn are all words that can be used to describe this behavior. VAUNT is a five letter word meaning to show off or boast about one's accomplishments. BRAG is a four letter word meaning to talk too proudly or too confidently about one's achievements. CROW is a four letter word meaning to boast or gloat about one's success. Talkbig is a seven letter word meaning to boast or exaggerate one's abilities. Finally, Tootyourownhorn is a fifteen letter phrase meaning to boast about one's own accomplishments.