What are comparative and superlative forms of crabby?

"Crabby" is an adjective, and it already expresses a superlative sense, meaning "extremely irritable or grumpy." Therefore, there are no comparative or superlative forms of "crabby" in the traditional sense.

However, you could use phrases like:

* More crabby: This implies someone is becoming increasingly grumpy.

* The most crabby: This highlights someone being extremely grumpy, even more so than others.

* Crabbiest: This is a more informal way to express the same meaning as "the most crabby."

It's important to note that using these phrases might not be grammatically "correct," but they are commonly used to express varying degrees of grumpiness.