adj. 25B6; adjective
he was a chatty person : TALKATIVE, communicative, expansive, unreserved, gossipy, gossiping, garrulous, loquacious, voluble, verbose; informal mouthy, gabby, gassy; Brit. informal able to talk the hind legs off a donkey.
a chatty letter : CONVERSATIONAL, gossipy, informal, casual, familiar, friendly; informal newsy.
taciturn.