Gerund/uncountable noun meaning 'boastful talk or display'.
vauntinggerund / present participle Used attributively and predicatively to describe boastful, bragging nature; morphologically a present participle functioning as adjective.
His vaunting attitude made him unpopular among his peers.
Его хвастливое поведение сделало его непопулярным среди сверстников.
vauntgerund / present participle Used attributively/literarily as in 'vaunting ambition'; functions as a present-participle adjective.