Blabbermouth

Pronunciation: /ˈbɫæbɝˈmaʊθ/

Blabbermouth (noun)

  1. A person who talks too much, often saying things they should keep private.
  2. A person who tells other people private information, especially by mistake or carelessness.

Examples

  • The blabbermouth kept talking through the whole meeting.
  • A blabbermouth can ruin a quiet conversation.