a big and serious misfortune or disaster (e.g. an earthquake or flood)

disaster; tragedy

a sudden and violent change (e.g. an earthquake, a political or social revolution)

disaster

a sudden event causing great suffering and destruction e.g. a flood

calamity; unhappy conclusion

a destroyed state; a state of financial collapse; a building that has been destroyed

situation of devastation

(an example of) a form of drama in which there is conflict and suffering and a sad ending; (an instance of) a very sad event, experience etc in real life

disaster