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1. An unfortunate state resulting from unfavourable outcomes
   - misfortune, tough luck, ill luck
    
2. An unpredictable outcome that is unfortunate
   "if I didn't have bad luck I wouldn't have any luck at all";
   - mischance, mishap
    
3. Unnecessary and unforeseen trouble resulting from an unfortunate event
   - misfortune

Type of: chance, circumstances, destiny, fate, fortune, hazard, lot, luck, portion, trouble

Antonym: good luck

Encyclopedia: Bad luck