joylessness       
noun [ U ] uk/ˈdʒɔɪ.ləs.nəs/ us/ˈdʒɔɪ.ləs.nəs/
 不快乐
the quality of showing or involving no happiness
  She shrugged and responded with a degree of joylessness. 她耸了耸肩,略带不快地做了回答。 
 There's a joylessness to these songs. 这些歌里有一种无趣。 
 See: joyless
 - More examples
- He exuded a certain joylessness.
- What is most striking is the joylessness of this book.
- You can hardly blame Pip for his joylessness.