disaster

(noun) a state of extreme (usually irremediable) ruin and misfortune. Synonyms: catastrophe. Examples: "Lack of funds has resulted in a catastrophe for our school system." "His policies were a disaster."

(noun) an event resulting in great loss and misfortune. Synonyms: calamity, catastrophe, tragedy, cataclysm. Examples: "The whole city was affected by the irremediable calamity." "The earthquake was a disaster."

(noun) an act that has disastrous consequences.