In an ungrateful manner, done in a way lacking gratitude.(adverb)
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Use "ungratefully" in a sentence
"This gave rather a pretty color; but still Mrs. Peterkin ungratefully said it tasted of anything but coffee."
"A negro-man whom I permitted to live here for a while did very ungratefully, that is to say, very thoughtlessly — destroy the window-shutters, and other loose work, for fire-wood, I having forgotten to supply him with that needful article, and he, poor man, being too bashful to acquaint me with his wants."
"Mr. Lofft would have said (perhaps publickly) that I had not only offended in relation to the new Vollm but had most ungratefully set him aside in the original publication."