Grouchy; peevish; bad-tempered.
Webster's New World
Unhappy, dissatisfied and/or irritable, a word which is particularly applied to babies and children or adults who are acting childishly.
Tommy feels grumpy today because his friend stole his ball.
Michael Finnell was grumpy, but became even grumpier when the Celtics lost.
Other Word Forms of Grumpy
Origin of Grumpy
grump + -y
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