Here are some examples of how to use "ingratitude" in a sentence:
* "Despite all the help she offered, she was met with only ingratitude."
* "The king's ingratitude towards his loyal subjects led to a rebellion."
* "Their ingratitude for the sacrifices made on their behalf was disheartening."
* "It's frustrating to see such a lack of gratitude and instead be met with ingratitude."