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Heartwarming
describes something that brings feelings of happiness, kindness, or love. It’s the kind of thing that makes your heart feel full and happy.

Examples:
1- It was heartwarming to see the entire neighborhood come together to help rebuild Mrs. Smith’s house after the storm.
2- One heartwarming story is about Ryan Kyote, a 9-year-old from Napa, California, who used his allowance in 2019 to pay off his classmates’ $74.50 lunch debt, inspiring national attention and similar acts of kindness.