mis·ad·ven·ture 
(mĭs′əd-vĕnchər)
(mĭs′əd-vĕnchər)n.
An instance of misfortune; a mishap.
[Middle English misaventure from Old French mesaventure, from mesavenir, to result in misfortune : mes-, badly; see MIS-1 + avenir, to turn out (from Latin advenīre, to come to; see ADVENT).]