ungrateful

形容词

1. 1

   不知感恩的、忘恩负义的

   She called him ungrateful for never thanking her for the help.

   她说他不知感恩，从来没为她的帮忙道过谢。

2. 2

   吃力不讨好的、徒劳的正式

   Teaching can feel like an ungrateful task at times.

   教书有时让人觉得是件吃力不讨好的工作。