This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. Lack of gratitude; ungratefulness.

n. A lack or absence of gratitude; thanklessness.

n. Lack of gratitude; insensibility to, forgetfulness of, or ill return for, kindness or favors received; unthankfulness; ungratefulness.

n. Lack of gratitude; indisposition to acknowledge or reciprocate favors; a state of unthankfulness for benefits conferred.

n. Synonyms See grateful.

n. a lack of gratitude

"And the more he yearned to be gone the more bitterly he blamed himself for what he called his ingratitude and faithlessness."

thankfulness    gratitude   

feeling   

ungrateful   

unthankfulness    ungratefulness   

perfidy    treachery    meanness    deceit    avarice    disobedience    falsehood    insolence    wickedness    disloyalty