Ingrate (noun)

A person who is ungrateful or does not show appreciation for kindness or benefits received.

Origin:

Middle english (denoting a person who does not show gratitude), from old french ingrat, from latin ingratus, from in- "not" + gratus "pleasing".

Examples:

1. She felt that her son was an ingrate who took all of her hard work for granted.
2. The charity was disappointed by the ingrates who didn't even write a thank you note for the gifts they received.
3. Despite all his good deeds, he was treated as an ingrate by the people he helped.
4. He was an ingrate who never thanked his parents for all they had done for him.
5. The ingrate didn't even offer to help his friend after he was bailed out of jail.