What is the comparative and superlative of grumpy?

There isn't a simple, direct comparative or superlative for "grumpy". This is because "grumpy" is already a comparative form of "grum", which is an older, less common word.

However, you can use these alternatives:

Comparative:

* Grumpier (more common)

* More grumpy

* Crosser

* Surllier

Superlative:

* Grumpiest (more common)

* Most grumpy

* Crossest

* Sullest

You can also use phrases like "more irritable" or "most irritable" depending on the context.