volubility (n.)

• candor
• communicativeness
• effusion
• effusiveness
• fluency
• frankness
• garrulity
• garrulousness
• glibness
• gregariousness
• gush
• long-windedness
• loquaciousness
• loquacity
• openness
• prolixity
• slush
• sociability
• talkativeness
• verbosity
• windiness