1. 名詞
   不可數名詞: (人的)不知感恩, 不領情/
   忘恩
   (事物的)吃力不討好, 不受注重
   

   同義字詞
   ingratitude,ungratefulness
   

例句

1. Thanklessness is a terrible thing.
2. You hear thanklessness , obscenity, thoughtlessness, hatred.
3. A spiritual sloth rooted in thanklessness and self-absorption.
4. "Pitt is the film's calm center, and he brings more nuance than one might think possible to a character living an unimaginable life," writes Andy Klein in the LA CityBeat . "Blanchett is perfect as always, despite the thanklessness of the role."