Ingratitude (noun)

1. The state or quality of being ungrateful; lack of gratitude.
2. The act of not being thankful or showing appreciation for kindness shown.

Origin:

This word is formed by the combination of the prefix "in-" meaning "not" and the word "gratitude" meaning "the quality of being thankful; readiness to show appreciation for and to return kindness".

Examples:

1. His ingratitude towards his parents was obvious.
2. The ingratitude of the employees was shown in their lack of appreciation for the bonuses they received.
3. The ingratitude of the client was clear when they refused to pay the bill.
4. The ingratitude of the group was apparent when they didn't thank the volunteers for their hard work.
5. Her ingratitude was shown in her lack of a thank you note.