Grumpy is a male dwarf.
Grumpy is one of the Seven Dwarfs living together in their cottage in an enchanted kingdom in the Black Forest, and spends his days mining for jewels with the others. As his name implies, Grumpy is known for his grinchy, bitter, cynical temper, and being very set in his way and resistant to any sort of change in his routine; but those rough edges conceal immense courage and loyalty. Along with his siblings, Grumpy took Snow White in after she fled from her stepmother's murderous intentions, and ended up befriending her.
Behind the scenes
Grumpy first appeared in 1937 in Snow White and the Seven Dwarfs.
Among the many unused Dwarves, one can find the name "Cranky" in development notes circa 1934. It is likely "Cranky" was to be a variation on the same character, more than a character in his own right.