Someone may be described as voluble if they are talking a lot in a rapid, energetic way.

// Bri knew something was bothering her normally voluble friend when he was reluctant to talk about his day.

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“The movie is built around an interview with the legendary 91-year-old actor, still vigorous and voluble, with a seize-the-day cornball glow to him. In ‘You Can Call Me Bill,’ Shatner sits under the hot lights, with the camera close to his face, talking, talking, and talking—about life, death, acting, fame, love, desolation, and trees.” — Owen Gleiberman, Variety, 16 Mar. 2023

In a chapter titled “Conversation,” from her 1922 book Etiquette in Society, in Business, in Politics, and at Home, Emily Post offers her trademark good advice for the loquacious among us: “There is a simple rule, by which if one is a voluble chatterer ... one can at least refrain from being a pest or a bore. And the rule is merely, to stop and think.” Voluble, as is clear in this context, describes someone or something (as in “voluble personality/prose/presence”) characterized by ready or rapid speech. Voluble traces back to the Latin verb volvere, meaning “to set in a circular course” or “to cause to roll.” Another volvere descendant, volume, can also be a help in remembering voluble’s meaning, not because someone described as voluble speaks at a loud volume, per se, but because they have volumes to say.