1
be unthankful to sb for sth
用于描述对某人或某事缺乏感激。
He was unthankful to his parents for their support.
他对父母的支持不知感恩。
不感激的；忘恩负义的
先理解核心含义，再看它在真实句子里的用法。
不感激的；忘恩负义的
not thankful; ungrateful
He was unthankful to his parents for their support.
他对父母的支持不知感恩。
不感谢的；忘恩负义的。
Not thankful; ungrateful.
After all the help they gave you, it seems unthankful to complain about the small details.
他们帮了你这么多，你还抱怨细节，似乎有点忘恩负义。
She felt unthankful for the gifts because she had never wanted them.
她对这些礼物并不感激，因为她从来不想要。
It is unthankful of him to ignore his parents' support.
他无视父母的支持，真不感恩。
用于描述对某人或某事缺乏感激。
He was unthankful to his parents for their support.
他对父母的支持不知感恩。
强调内心感受。
She felt unthankful despite receiving many gifts.
尽管收到很多礼物，她仍不感恩。
用作定语修饰名词。
He is an unthankful child.
他是个不知感恩的孩子。
表示持续状态。
The spoiled child remained unthankful.
那个被宠坏的孩子依然不知感恩。
Not this
Unthankful is a bad quality.
Use this
Unthankfulness is a bad quality.
形容词"unthankful"不能直接作主语，应使用其名词形式"unthankfulness"表示“不感恩”这一品质。
Not this
She was unthankful for her parents.
Use this
She was unthankful to her parents.
形容词"unthankful"后接表示对象的介词时应用"to"而非"for"，"for"用于引出原因或事情。
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Dictionary facts from ECDICT, WIKTIONARY.