| 单词 | ungrateful | 
| 释义 | Word Frequency ungrateful(ʌnˈɡreɪtfʊl) adjective 1.  not grateful or thankful  2.  unrewarding or unpleasant; thankless  3.  (of land) failing to increase fertility in response to cultivation  Derived formsungratefully (unˈgratefully) adverb ungratefulness (unˈgratefulness)  noun | 
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