1. in a manner that expresses excessive pride or self-importance about one's achievements or possessions

Examples

• He boastingly told everyone about his promotion before the official announcement.
• She spoke boastingly of her athletic achievements throughout the entire dinner.
• The candidate boastingly claimed he was the most qualified person for the job.
• He boastingly displayed his new car to all his neighbors.
• She boastingly mentioned her high test scores to her classmates.
• The team captain boastingly predicted they would win the championship.