This word is acceptable for play in the UK dictionary that is being used in the following games:

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• Wordscraper
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n. The state or condition of being unthankful; ingratitude.

n. Ungratefulness; want of a sense of kindness or benefits; ingratitude.

"Her duty and her gratitude, she gravely said, to the Dispenser of all good, would secure her, she hoped, against unthankfulness."

ingratitude   

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