talking a lot, and with enthusiasm, about a subject 健谈的；滔滔不绝的 expressed in many words and spoken quickly 流利的；明快的 voluble protests 振振有词的抗议
Word OriginMiddle English (in senses ‘rotating about an axis’ and ‘having a tendency to change’): from French, or from Latin volubilis, from volvere ‘to roll’. The modern meanings arose in the late 16th cent.