killjoy /ˈkɪlˌdʒɔɪ/

• 1. 

  N-COUNT If you call someone a killjoy, you are critical of them because they stop other people from enjoying themselves, often by reminding them of something unpleasant. 扫兴者 [表不满]

  例：

  Don't be such a killjoy!

  别那么扫兴！