Wiktionary
a. mute, or not speaking; silent. n. 1 An old game of chance played with cards in silence. 2 A silent, stupid person.
Usage examples of "mumchance".
As none of Master Nathaniel measures brought to light a single smuggler or a single consignment of fairy fruit, the Senate were beginning to congratulate themselves on having at last destroyed the evil that for centuries had menaced their country, when Mumchance discovered in one day three people clearly under the influence of the mysterious drug and with their mouth and hands stained with strangely coloured juices.
That afternoon Mumchance came to Master Polydore to inform him that a young maid-servant from the Academy had just been to the guard-room to say that Miss Primrose Crabapple had killed herself.
It was the launch and it was filled with liberty-men: there were still one or two merry souls among them, but on the whole the Sophies who could walk were quite unlike those who had gone ashore - they had no money left, for one thing, and they were grey, drooping and mumchance for another.