cataclysmic
adjective/ˌkætəˈklɪzmɪk/
/ˌkætəˈklɪzmɪk/
[usually before noun] (formal)- (of a natural event) causing sudden and violent change synonym catastrophic (1)
- a cataclysmic earthquake/flood/eruption
- extreme and very bad
- cataclysmic changes in society
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cataclysmic