We can also call this person a sourpuss.

我们也可以称呼这" 满腹牢骚（sourpuss）" 。

You'd better not wreck my trip, you little sourpuss.

你最好别破坏我旅行。

Well, get this, there's a new sourpuss in town - Judgey Cat.

好吧，说点新鲜，最近又有一只独特猫出现——严肃猫。

And even if she was brainy she was an old sourpuss.

即使她很聪明， 她也是个老脾气。

Yeah, you weren't with the sourpuss all day.

你和这个满腹牢骚家伙呆一整天试试？

His face was frozen in a deep cutting scowl, emanating what I can only describe as sourpuss energy.

脸上凝固着一深深刻薄表情，散发出一我只能形容酸脸气息。

And you should win a trophy for being such a sourpuss!

你应该得个超级叽歪奖！

Could you for once stop being such a sourpuss and just lighten up?

哦，对不起哟？