Absolute neglect of the mother and sisters, when invited to come, would be ingratitude.
She could think of nothing better: and though there was something in it which her own heart could not approve—something of ingratitude, merely glossed over—it must be done, or what would become of Harriet?
I, who am owing all my happiness to you, would not it be horrible ingratitude in me to be severe on them?
There are no more uses of "ingratitude" in the book.
Show samples from other sources
"Boy," Mrs. Amos said, "I am not the least bit surprised at your show of ingratitude.
Christopher Paul Curtis -- Bud, Not Buddy
I remember he used words like ’failure’ and ’ingratitude,’ and once he said very clearly, ’I know how well I have performed my duty.’