adjective, chat·ti·er, chat·ti·est.
Examples from the Web for chattiness
But Phil cannot so deftly change the color of his talk; his chattiness has all gone from him.
But when Bradish appeared, answering the captain's summons, all his chattiness had left him.Blow The Man Down|Holman Day
The result is a mixture of formality and chattiness which seems to me all wrong.Once a Week|Alan Alexander Milne