After the team covered his shifts all month, he acted like an ingrate and complained.

整個月團隊都幫他代班，他卻像個忘恩負義的人一樣抱怨連連。

The manager refused to look like an ingrate, so she emailed thanks to every volunteer.

經理不想被當成忘恩負義的人，於是寄電子郵件感謝每位志工。

Our client called the free upgrade useless, behaving like a complete ingrate at the front desk.

那位客戶在櫃檯說免費升等毫無用處，表現得像個十足忘恩負義的人。