In a manner that shows generosity, nobility, and courage; with a big-hearted and noble spirit.
Derived from 'greathearted' plus the adverbial suffix '-ly' (from Old English '-lice'), which transforms adjectives into adverbs describing how an action is performed.
The '-ly' suffix is one of English's most productive tools—you can almost never go wrong adding it to adjectives. It's why we can instantly understand 'greatheartedly' even if we've never heard it before!
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