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The Collaborative International Dictionary
blabbermouthed

blabbermouthed \blabbermouthed\ adj.

  1. tending to talk excessively.

    Syn: bigmouthed, blabby, talkative.

  2. prone to revealing secrets; -- of people.

    Syn: leaky, talebearing(prenominal), tattling(prenominal).

WordNet
blabbermouthed
  1. adj. unwisely talking too much [syn: bigmouthed, blabby, talkative]

  2. prone to communicate confidential information [syn: leaky, talebearing(a), tattling(a)]