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