1. chatty, gabby, garrulous, loquacious, talkative, talky, voluble (vs. taciturn)

usage: full of trivial conversation; "kept from her housework by gabby neighbors"

2. bigmouthed, blabbermouthed, blabby, talkative, indiscreet (vs. discreet)

usage: unwisely talking too much

3. expansive, talkative, communicative (vs. uncommunicative), communicatory

usage: friendly and open and willing to talk; "wine made the guest expansive"

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See also: talkative (Dictionary)