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Adjective: blabbermouthed  'bla-bu(r),mawthd or 'bla-bu(r),mawdhd
  1. Unwisely talking too much
    - bigmouthed, blabby, talkative
     
  2. Prone to communicate confidential information
    - leaky, talebearing, tattling

See also: communicative, communicatory, indiscreet