Definition of "misadventured"

From forth the fatal loins of these two foesA pair of star-cross'd lovers take their life;Whose misadventured piteous overthrowsDo with their death bury their parents' strife.

c. 1591–1595 (date written), William Shakespeare, “The Tragedie of Romeo and Ivliet”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, (please specify the act number in uppercase Roman numerals, and the scene number in lowercase Roman numerals)