ungrateful

形容詞

1. 1

   不知感恩的、忘恩負義的

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

   她說他不知感恩，從來沒為她的幫忙道過謝。

2. 2

   吃力不討好的、徒勞的正式

   Teaching can feel like an ungrateful task at times.

   教書有時讓人覺得是件吃力不討好的工作。