adjective, grumpier, grumpiest.
surly or ill-tempered; discontentedly or sullenly irritable; grouchy.
Also, grumpish.

1770–80; grump expressive word, first attested in the phrase humps and grumps slights and snubs + -y1

grumpily, adverb
grumpiness, noun
ungrumpy, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
grumpy or grumpish (ˈɡrʌmpɪ, ˈɡrʌmpɪʃ)
adj , grumpier, grumpiest
peevish; sulky
[C18: from grump + -y1]
grumpish or grumpish
[C18: from grump + -y1]
'grumpily or grumpish
'grumpishly or grumpish
'grumpiness or grumpish
'grumpishness or grumpish

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
It could be that you're all in the winter grumpy blah mood boat.
And it was downright grumpy about the idea that aid might actually work.
In my experience it is the grumpy people that live longer.
But until yesterday, the ethanol lobby was rather grumpy.
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