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
不感谢的；忘恩负义的。；不被领情的；不感恩的；不知感谢的
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。
用法提示：unthankful 作表语形容词，描述对别人提供的帮助不感激。
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。
用法提示：unthankful 与 for 搭配，作表语，表示对某事物不感激。
It is unthankful of him to ignore his parents' support.
他无视父母的支持，真不感恩。
用法提示：unthankful 用在 It is unthankful of... 结构中，评价某人的行为是忘恩负义。
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。
grammar · medium
易错句子Unthankful is a bad quality.
正确表达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。
grammar · medium
易错句子She was unthankful for her parents.
正确表达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。
ungrateful 侧重内心不知感恩，带有道德谴责意味；unthankful 指行为上不表示感谢，语气较中性
thankless 可形容人或工作，指对方不领情或工作得不到感谢；unthankful 仅形容人不愿感谢
unthanked 表示没有收到感谢的结果；unthankful 表示主观上不愿感谢
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