IPA: /ˈtɔːkətɪvnəs/
KK: /tɔːkətɪvnəs/
The quality of being very chatty or inclined to talk a lot.
Her talkativeness made her the life of the party, as she could engage anyone in conversation.
Talkativeness → It is formed from "talk" (from Old English *tælcian*, meaning to speak or tell) and "-iveness" (a suffix indicating a state or quality). The word "talkativeness" refers to the quality or state of being talkative or inclined to talk a lot.
Think of the act of 'speaking' ('talk') and the quality of being that way ('-iveness') — that's why talkativeness means the quality of being inclined to talk.