Meaning of “disastrous” in the English Dictionary

"disastrous" in British English

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uk /dɪˈzɑː.strəs/ us /dɪˈzæs.trəs/

C1 extremely bad or unsuccessful:

Such a war would be disastrous for the country.
This decision will have a disastrous impact on foreign policy.
His first attempt was disastrous.

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adverb uk /dɪˈzɑː.strə us /dɪˈzæs.trə

Things began to go disastrously wrong.

(Definition of “disastrous” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"disastrous" in American English

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us /dɪˈzæs·trəs/

causing great harm, damage, or suffering:

It was a disastrous mistake which he lived to regret.
In 1837, there was a disastrous smallpox epidemic.

fig. Something that is disastrous is a complete failure:

His attempt to play the piano was disastrous.

(Definition of “disastrous” from the Cambridge Academic Content Dictionary © Cambridge University Press)