chatterbox

/ˈtʃætərˌbɑks/
noun
  1. A person who talks a lot, especially about unimportant things.
    • My little sister is such a chatterbox; she talks from morning until night.
    • He's a friendly chatterbox who can strike up a conversation with anyone.
    • The teacher had to ask the chatterbox in the back row to be quiet.
Antonyms
What does "chatterbox" mean? | whatsthatwordmean | whatsthatwordmean