Definitions

1. noun

a young person, especially a child or a teenager, with an intense emotional or spiritual connection to the heart, often in a mystical or metaphysical sense

“She was known as a heartling, possessing an innate sensitivity to the emotions of those around her.”

2. noun

a young person who is deeply devoted to a particular cause, idea, or movement, often displaying great enthusiasm and energy

“The heartling of the environmental movement spent countless hours volunteering and raising awareness about the importance of conservation.”