Definition of "mischance"

But let this same be presently perform'd / Even when men's minds are wild, lest more mischance / On plots and errors happen.

c. 1599–1602 (date written), William Shakespeare, “The Tragedie of Hamlet, Prince of Denmarke”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, [Act V, scene ii]

I write gaily enough, for there is no use in bewailing such a hopeless mischance.

1848 November – 1850 December, William Makepeace Thackeray, chapter 73, in The History of Pendennis. […], volumes (please specify |volume=I or II), London: Bradbury and Evans, […], published 1849–1850

He doth miraculously protect from thieves, incursions, sword, fire, and all violent mischances […]

1624, Democritus Junior [pseudonym; Robert Burton], The Anatomy of Melancholy: […], 2nd edition, Oxford, Oxfordshire: Printed by John Lichfield and James Short, for Henry Cripps, partition II, section 3, member 3