i Register
In some senses, grump is marked as informal. Watch for register when choosing this word.
noun
A habitually grumpy or complaining person.
A grumpy mood.
If you're not taking Action to change the situation, either sit in a grump or Accept it.
verb
To complain.
Grumping to himself as he made up his own bed, Bradly thought, "Have to wash that blanket; young blighter going to bed with all that mud on his feet."
To be grumpy.