ingrate
/ˈɪŋɡreɪt/Definitions
1. noun
A person who shows ungratefulness or ingratitude, especially towards someone who has helped them.
“She couldn’t understand why her mother would think of her as an ingrate after she had been so unkind to her.”
2. verb
To show a lack of gratitude or to be ungrateful.
“He ingrates his benefactor by not even thanking him for the help he provided.”