Synonyms of 'grumpy'
ratty (British, New Zealand, informal)
cross and irritable
I was beginning to get a bit ratty and fed up.
moody or silent because of anger or resentment
a sulky adolescent
unwilling to talk or be sociable
The offenders lapsed into a sullen silence.
bad-tempered and rude
He behaves in a surly and rude manner towards me.
irritable or touchy
Ben's getting a little testy in his old age.
cross, irritable, or touchy
You always get tetchy when you're hungry.
Thesaurus for grumpy from the Collins English Thesaurus