To hearten someone means to give them courage, hope, or confidence when they're feeling discouraged or uncertain.

When a coach heartens their team at halftime with an inspiring speech, they're helping players believe in themselves again after a rough first half. When a friend's encouragement heartens you before a difficult piano recital, their support makes you feel braver and more capable.

The word often appears in its opposite form: disheartened. When you feel disheartened, you've lost confidence or hope, like after failing a test you studied hard for. But then something heartening happens: maybe your teacher offers extra help, or you realize you understand more than you thought. That heartening moment lifts your spirits and makes you want to try again.

Truly heartening words or actions give people real reasons to hope: pointing out their strengths, showing them a path forward, or reminding them of past successes. When scientists make a heartening discovery about treating a disease, they're giving patients genuine reasons for hope based on real progress. Heartening differs from empty cheerleading or fake optimism because it offers substance, something concrete to believe in.