humorless /ˈhjuːmələs/

• 1. 

  ADJ If you accuse someone of being humourless, you mean that they are very serious about everything and do not find things amusing. 缺乏幽默感的; 非常严肃的 [表不满]

  例：

  This man was as humourless as a dictionary.

  这个男人像本字典一样一本正经。