Adjectives

(s)chatty, gabby, garrulous, loquacious, talkative, talkyfull of trivial conversation“kept from her housework by gabby neighbors”
(s)bigmouthed, blabbermouthed, blabby, talkativeunwisely talking too much
(s)expansive, talkativefriendly and open and willing to talk“wine made the guest expansive”