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English word grumpy comes from English -y, English grump
-y (English)
Forming abstract nouns denoting a state, condition, or quality.. Used in the name of some locations which end in -ia in Latin. Forming diminutive nouns. Also used for familiar and pet names as a term of endearment. Added to nouns and adjectives to form adjectives meaning “having the quality of”.. Added to verbs to form adjectives meaning "inclined to".
grump (English)
(informal, intransitive) To be grumpy.. (informal, intransitive) To complain. (informal) A habitually grumpy or complaining person.
grumpy (English)
Unhappy, dissatisfied and/or irritable.