IPA: //kaɪndˈhɑːrtɪdli//
KK: /kaɪndˈhɑrtɪdli/
In a way that shows kindness and compassion towards others.
She kindheartedly offered her help to the struggling family.
Kindheartedly → It is formed from "kind" (from Old English *cynd*, meaning natural or innate) and "hearted" (from "heart" which refers to the seat of emotions) and the suffix "-ly" (meaning in a manner of). The word "kindheartedly" means in a manner that shows a natural inclination to be compassionate and caring.
Think of someone who is naturally caring ('kind') and shows their emotions ('hearted') in a gentle way — that's what it means to act 'kindheartedly'.