It was ingratitude of the blackest character, to listen so coldly to his wishes.
Again and again Shakespeare rails at man's ingratitude, but nothing more.
The one bitterness of his life, indeed, was due to ingratitude.
Though every sinner be ungrateful, yet every sinner is not a monster of ingratitude.
Ah, the ingratitude of the masses is a disgrace to civilised humanity!