Voluble describes someone who talks a lot, like your aunt who can’t stop telling you to cut your hair or a political candidate who makes twenty speeches on the day before the election.
Have you ever found it especially hard to interrupt someone who talks a lot when he or she gets on a roll? If so, it won’t surprise you that the adjective voluble traces back to the Latin word volvere, meaning “to roll.” The word voluble describes talking continuously, fluently, at great length, in a steady flow. You’ll know it when you meet voluble talkers: they just keep rolling on and on.