"to happen ill, meet with misfortune, come to grief," mid-14c., from mis- (1) + happen. Related: Mishappened; mishappening. The word now is obsolete. Chaucer uses mishappy; mishappiness was in use 16c.-17c.
misguidance
misguide
misguided
mishandle
mishap
mishappen
mishear
mishmash
Mishnaic
misidentification
misidentify