ingratitude (noun)

1. Despite all the efforts and sacrifices I made for her, her ingratitude hurt me deeply.

2. The simple and elegant design of this house reflects the ingratitude of the owner.

3. The designer's collection was inspired by the theme of ingratitude, showcasing dark and unappreciative elements.

4. In the cartoon, the villain exemplified ingratitude by betraying the hero who had always helped him.