Definition of misadventure noun from the Oxford Advanced Learner's Dictionary
misadventure
noun
ˌmɪsədˈventʃə(r) ˌmɪsədˈventʃər
1[uncountable] (British English, law) death caused by accident, rather than as a result of a crimea verdict of death by misadventure2[countable, uncountable] (formal) bad luck or a small accident