adverb taking the 'to' particle, taru-adjective, noun or participle which takes 'suru', noun
glibly; volubly; at great length
Formal or literary adverb describing someone talking smoothly and at length, often with a negative nuance of being too talkative or slick. Used with と (e.g., 喋々と) or as a する verb.
彼は自分の成功について喋々と語った。
He talked glibly about his success.
会議で彼女は喋々と意見を述べた。
She volubly expressed her opinions at the meeting.