noun a person who shows no gratitude.
— synonyms: thankless_wretch, ungrateful_person
Examples
“1843, But Mr Pecksniff, dismissing all ephemeral considerations of social pleasure and enjoyment, concentrated his meditations on the one great virtuous purpose before him, of casting out that ingrate and deceiver, whose presence yet troubled his domestic hearth, and was a sacrilege upon the altars of his household gods. — Charles Dickens, Martin Chuzzlewit”