Commentary Par XXVII 130

The gerund balbuzïendo, used as participle (repeated in [Par XXVII 133]), picks up the adjective balba (stammering) from [Purg XIX 7], the description of the foul seductress in Dante's second Purgatorial dream.  There it contrasted with the false beauty and eloquence that the dreaming protagonist lent her; here it is the sign of innocence and immaturity that is preferable to mature and calculated evildoing.