Synonyms of 'catastrophic'
disastrousDictionary, devastating, tragicA tidal wave caused catastrophic damage.
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If you describe an event or situation as calamitous, you mean it is very unfortunate or serious.
a calamitous air crash
A cataclysmic event is one that changes a situation or society very greatly, especially in an unpleasant way.
Few had expected the change to be as cataclysmic as it was.
Video: pronunciation of 'catastrophic'
Thesaurus for catastrophic from the Collins English Thesaurus
Something that is catastrophic involves or causes a sudden terrible disaster .