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Use "talkativeness" in a sentence
"How he managed to say it all in one breath, she would never know, but for once his talkativeness was a blessing."
"The reason of his talkativeness was the success I had attained in my first morning's walk, for I had sold nearly all the meat, and brought home a pocket full of small money."
"There was also a small effect size for them when it came to speech production, talkativeness, affiliative speech and self-disclosure."