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If you describe someone as ungrateful, you are criticizing them for not showing thanks or for being unkind to someone who has helped them or done them a favour.
I thought it was ungrateful of her.
我认为她这是不知好歹。
雅思英语词汇收录8785个雅思英语词条，基本涵盖了全部常用雅思英语词汇的翻译及释义，是英语学习的有利工具。