grouch|grouching

别总当个爱抱怨的人，试着找点乐子吧。

Don't be such a ___grouch all the time, try to find some joy.

别总是为小事发牢骚，这解决不了问题。

Stop ___grouching about small things—it won't solve anything.

别理他，他就是个爱抱怨的老顽固。

Don't mind him, he's just a ___grouch who complains about everything.