by mischance

1 不幸

bad poor tough evil rough sticky unfortunate unhappy miserable unsuccessful disastrous unlucky wretched fateful hapless ill-fated accursed untoward calamitous inauspicious luckless ill-starred jinxed infelicitous ill-omened unblest unblessed fortuneless badly-off funest wanchancy unfortunately sadly tragically miserably unhappily unluckily calamitously adverseness ill-being cross trouble blow reverse knock disaster tragedy sorrow misery bale fatality misfortune unhappiness ill jinx misadventure mischance infelicity in an evil hour in an ill hour by misadventure hard cheese hard lines but too only too hard luck

2 不巧

unlucky unfortunately unhappily unluckily as it happens