IPA: /ˈsɔːfˈhɑːrtɪdnəs/
KK: /sɔftˈhɑrtɪdnəs/
The quality of being kind, gentle, and easily moved to sympathy or compassion.
Her softheartedness made her a great friend to those in need.
Softheartedness → It is formed from "soft" (from Old English "softe", meaning gentle or mild), "heart" (from Old English "heorte", meaning the organ of feeling or emotion), and "-ness" (a suffix meaning the state or quality of). The word "softheartedness" refers to the quality of being gentle and compassionate in feelings.
Think of being 'gentle' ('soft') and having a 'feeling' ('heart') — that's what softheartedness means, the quality of being gentle and compassionate.