catastrophic

US /ˌkæt̬.əˈstrɑː.fɪk/
UK /ˌkæt̬.əˈstrɑː.fɪk/
"catastrophic" picture
1.

involving or causing sudden great damage or suffering

:
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The earthquake caused catastrophic damage to the city.
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A sudden drop in sales could have a catastrophic effect on the company.
:
disastrouscalamitousruinousdevastatingtragic
:
catastrophecatastrophe theory