Definition of “grumpy” - English Dictionary

“grumpy” in British English

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grumpyadjective

uk /ˈɡrʌm.pi/ us /ˈɡrʌm.pi/ informal
grumpily
adverb uk /ˈɡrʌm.pəl.i/ us /ˈɡrʌm.pəl.i/
grumpiness
noun [ U ] uk /ˈɡrʌm.pi.nəs/ us /ˈɡrʌm.pi.nəs/

(Definition of “grumpy” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

“grumpy” in American English

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grumpyadjective

us /ˈɡrʌm·pi/ infml

being in a slightly angry mood because you are annoyed at something or are feeling tired:

Dad is always grumpy on Monday mornings.

(Definition of “grumpy” from the Cambridge Academic Content Dictionary © Cambridge University Press)