Examples of use of unthankful
1. "Those bankers are unthankful because they got so much from me and vote for Alckmin," the Workers‘ Party president said.
2. It was he who, who, having done his work by conract and not been paid as promised, uttered that remarkable phrase in his remonstrance: "If I had done so and so, then I should have been a Manchester man, for never let an unthankful man and promise breaker have another name". EE