Definition of grumpy adjective from the Oxford Advanced Learner's Dictionary

 

grumpy

 adjective
adjective
BrE BrE//ˈɡrʌmpi//
 
; NAmE NAmE//ˈɡrʌmpi//
 
(grumpier, grumpiest)(informal)
 
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bad-tempered Pay no attention to his moods—he’s just a grumpy old man.
See the Oxford Advanced American Dictionary entry: grumpy