mischance (n.)

c. 1300, from Old French mescheance "misfortune, mishap, accident; wickedness, malice," from Vulgar Latin *minuscadentiam; see mis- (2) + chance (n.). Now usually "bad luck;" formerly much stronger: "calamity, disaster."

1540s, from mis- (1) + chance (v.). Related: Mischanced; mischancing.