Loquacious means extremely talkative: someone who loves to talk and does so at great length. A loquacious person talks continuously, seeming to have an endless supply of things to say.

You might have a loquacious aunt who tells long, detailed stories at every family gathering, or a loquacious seatmate on the bus who shares their entire life story during a twenty-minute ride. Teachers sometimes struggle with loquacious students who raise their hands constantly and give very long answers to simple questions.

The word carries a slightly humorous tone. When you call someone loquacious, you're usually gently pointing out that they talk a lot, perhaps more than the situation calls for. It's not quite an insult, but it's not entirely a compliment either. Compare it to talkative (neutral), chatty (friendly), or verbose (more critical, focusing on using too many words).

If you're trying to finish your homework but your loquacious friend keeps talking about their weekend plans, you understand exactly what loquacious means. The opposite would be taciturn or laconic: someone who speaks very little.