adjective
a word that describes or modifies a noun or pronoun, in this case, 'ungrudging' describes someone who gives or shares without hesitation or reluctance
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She offered her help ungrudgingly, despite the inconvenience it caused her.
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He always shares his snacks ungrudgingly with his friends.
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I'll do it for you, no worries, ungrudgingly.
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The sun shines ungrudgingly upon all living creatures.