WordWeb Online

1. A state of extreme (usually irremediable) ruin and misfortune
   "his policies were a disaster";
   - catastrophe
    
2. An event resulting in great loss and misfortune
   "the earthquake was a disaster";
   - calamity, catastrophe, tragedy, cataclysm
    
3. An act that has disastrous consequences

Derived forms: disasters

Type of: adversity, bad luck, destruction, devastation, hard knocks, hardship, misfortune

Encyclopedia: Disaster