Synonyms: blabbermouthed, talebearing, tattling, leaky
Definition: prone to communicate confidential information
Similar words: communicative, communicatory
Definition: able or tending to communicate
Usage: was a communicative person and quickly told all she knew- W.M.Thackeray
Synonyms: talkative, bigmouthed, blabbermouthed, blabby
Definition: unwisely talking too much
Similar words: indiscreet
Definition: lacking discretion; injudicious
Usage: her behavior was indiscreet at the very best