Grumpy vs Feisty - What's the difference?

As adjectives the difference between grumpy and feisty

is that grumpy is unhappy, dissatisfied and/or irritable while feisty is tenacious, energetic, spunky.

(er)

Unhappy, dissatisfied and/or irritable.

Tommy feels grumpy today because his friend stole his ball.

Michael Finnell was grumpy''', but became even '''grumpier when the Celtics lost.

* grouchy * surly * truculent

(en-adj)

Tenacious, energetic, spunky.

Belligerent; prepared to stand and fight, especially in spite of relatively small stature or some other disadvantage.

Easily offended and ready to bicker.

* feistily * feistiness