Sudden misfortune can be described as a sudden, unexpected event that causes great distress or harm. In this case, the crossword solutions for the term 'sudden misfortune' are 'BLOW' (4 letters) and 'DISASTER' (8 letters). The word 'BLOW' is often used to refer to a sudden, unexpected event, while 'DISASTER' is a more extreme term that implies a much greater degree of destruction or harm. Both words can be used to describe sudden misfortune.