The difference between Cantankerous and Grumpy
When used as adjectives, cantankerous means given to or marked by an ill-tempered nature, whereas grumpy means dissatisfied and irritable.
check bellow for the other definitions of Cantankerous and Grumpy
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Cantankerous as an adjective:
Given to or marked by an ill-tempered nature; ill-tempered, cranky, surly, crabby.
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Grumpy as an adjective:
Dissatisfied and irritable.
Examples:
"Tommy feels very grumpy today because his friend stole his ball."