an unthankful task
费力不讨好的工作
You can call a man no worse than unthankful
骂人最厉害莫过于骂他忘恩负义
Stop weeping for such an unthankful man like him!
何必为他没良心的人哭泣呢？
She was unthankful to her boy friend for his gift.
她并不感谢男朋友送东西给她。
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