A loquacious person talks a lot, often about stuff that only they think is interesting. You can also call them chatty or gabby, but either way, they're loquacious.

Whenever you see the Latin loqu-, you can be sure that the word has something to do with "talking." So a loquacious person is a person who talks a lot, and often too much. Sitting next to a loquacious person at a dinner party can make dinner a real drag. Of course, if you've got nothing to say, a loquacious person might make a good dinner companion, because they'll do all the talking. All you will have to do is smile and eat.

Definitions of loquacious

adj full of trivial conversation

chatty, gabby, garrulous, talkative, talky
marked by a ready flow of speech