voluble (adj.)youdaoicibaDictYouDict[voluble 词源字典]
early 15c., "liable to constant change," from Middle French voluble, from Latin volubilis "that turns around, rolling, flowing," figuratively (of speech) "fluent, rapid," from volvere "to turn around, roll" (see volvox). Meaning "fluent, talkative" first recorded 1580s. Related: Volubly.[voluble etymology, voluble origin, 英语词源]