gruñón in English:

Why does Tom look so grumpy today?

Why does he look grumpy?

Why is he so grumpy first thing in the morning? - It's the nightmares. He's having them again.

grumpy cat

What happened? Why are you so grumpy?

Others are just grumpy and feel like they hate the world.

A grumpy old men

Mina’s always a bit grumpy first thing in the morning.

Greg’s my best friend but he’s really grumpy at times.

and its face looked grumpy and oddly squashed,

I hadn't had enough sleep and was feeling kind of grumpy.

Jane has been quiet and grumpy for the past few days

his teacher is grumpy

You are always so grumpy before you've had your morning coffee.

his performance as the grumpy gateman / he’s grumpy because he hasn’t heard from you