cataclysmic       
adjective  literary uk/ˌkæt.əˈklɪz.mɪk/ us/ˌkæt̬.əˈklɪz.mɪk/
 灾难性的
causing a lot of destruction, or a sudden, violent change
  These countries are on the brink of cataclysmic famine. 这些国家就要爆发灾难性的大饥荒了。 
 a cataclysmic eruption/tsunami/earthquake 灾难性的(火山)爆发/灾难性的海啸/灾难性的地震 
 See: cataclysm
 - More examples
 - Some events may have small consequences, while others are nearly cataclysmic in their impact.
 - The Depression was a worldwide cataclysmic event.
 - Greenhouse gases could cause a cataclysmic change in the world's climate.
 - Saturn’s rings weren't formed by a single cataclysmic event.
 - The consequences of bankruptcy are potentially cataclysmic.