Longman Dictionary of Contemporary English homepage

disastrous

 adjective
     
di‧sas‧trous
very bad, or ending in failure:
a disastrous first marriage
disastrous effects/consequences/results
Climate change could have disastrous effects on Earth.
The move proved disastrous (=was disastrous) for the company.
—disastrously adverb
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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