IPA: //ˌwɔːrmˈhɑːrtɪdnəs//
KK: /ˈwɔrmˌhɑrtɪdnəs/
The quality of being kind, caring, and friendly towards others.
Her warmheartedness made everyone feel welcome at the party.
Warmheartedness → It is formed from "warm" (from Old English *wearm*, meaning having a moderate degree of heat) and "heartedness" (from "heart" which comes from Old English *heorte*, meaning the organ that pumps blood, often symbolizing emotion, plus the suffix "-ness" which indicates a state or quality). The word "warmheartedness" refers to the quality of being kind, compassionate, and emotionally warm.
Think of 'warm' as having a comforting heat and 'heartedness' as relating to emotions — together, they describe a state of being emotionally warm and kind.