blabbermouthed

from WordNet (r) 3.0 (2006)

blabbermouthed
    adj 1: unwisely talking too much [syn: {bigmouthed},
           {blabbermouthed}, {blabby}, {talkative}]
    2: prone to communicate confidential information [syn:
       {blabbermouthed}, {leaky}, {talebearing(a)}, {tattling(a)}]

from The Collaborative International Dictionary of English v.0.48

blabbermouthed \blabbermouthed\ adj.
   1. tending to talk excessively.

   Syn: bigmouthed, blabby, talkative.
        [WordNet 1.5]

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

   Syn: leaky, talebearing(prenominal), tattling(prenominal).
        [WordNet 1.5]

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