The difference between Grouchy and Grumpy
When used as adjectives, grouchy means irritable, whereas grumpy means dissatisfied and irritable.
check bellow for the other definitions of Grouchy and Grumpy
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Grouchy as an adjective (originally, student slang):
Irritable; easily upset; angry; tending to complain.
Examples:
"His boss gets grouchy when deadlines draw near."
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Grumpy as an adjective:
Dissatisfied and irritable.
Examples:
"Tommy feels very grumpy today because his friend stole his ball."