The state or quality of being kind-hearted; benevolence.(noun)
Gnu Collaboartive International Dictionary of English: licensed under The Code Project Open License (CPOL)
Use "kind-heartedness" in a sentence
"The kind-heartedness of the comforters was evident in their answers when asked about self-care."
"With increasing vehemence, though, conservatives have begun to argue that kind-heartedness, compassion, and a sense of community are actually evil: that they lead inevitably to Nazism and death camps."
"Roger and Lynne, both from Trinidad, rival Patricia in poetic talent and kind-heartedness."