IPA: /kəˈtæstrəfɪk/
KK: /kæˈtæstrəfɪk/
Relating to a sudden and severe disaster or event that causes great damage or suffering.
The earthquake had catastrophic effects on the city, destroying many buildings and displacing thousands of people.
Catastrophic → It is formed from "cata-" (meaning down) and "strophe" (from Greek "strophē", meaning turn or change). The word "catastrophic" refers to a sudden and often disastrous change or turn of events.
Think of a situation that takes a 'downward turn' ('cata-') leading to disaster or chaos, which is what catastrophic means.