kind-heartedness(n = noun.feeling) kindheartedness - sympathy arising from a kind heart; Array
is a kind of fellow feeling, sympathy
has particulars: mellowness

   The state or quality of being kind-hearted; benevolence. [1913 Webster]

N  benevolence, Christian charity, God's love, God's grace, good will, philanthropy, unselfishness, good nature, good feeling, good wishes, kindness, kindliness, loving-kindness, benignity, brotherly love, charity, humanity, fellow-feeling, sympathy, goodness of heart, warmth of heart, bonhomie, kind-heartedness, amiability, milk of human kindness, tenderness, love, friendship, toleration, consideration, generosity, mercy, charitableness, bounty, almsgiving, good works, beneficence, the luxury of doing good, acts of kindness, a good turn, good offices, kind offices good treatment, kind treatment, good Samaritan, sympathizer, bon enfant, altruist, benevolent, kind, kindly, well-meaning, amiable, obliging, accommodating, indulgent, gracious, complacent, good-humored, warm-hearted, kind-hearted, tender-hearted, large-hearted, broad- hearted, merciful, charitable, beneficent, humane, benignant, bounteous, bountiful, good-natured, well-natured, spleenless, sympathizing, sympathetic, complaisant, well-meant, well-intentioned, fatherly, motherly, brotherly, sisterly, paternal, maternal, fraternal, sororal, friendly, with a good intention, with the best intentions, Int, Godspeed!, much good may it do!, act a charity sometimes, a tender heart, a will inflexible, de mortuis nil nisi bonum, say only good things about the dead, don't speak ill of the dead, kind words are more than coronets, quando amigo pide no hay manana, the social smile, the sympathetic tear.