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English definition of “disastrous”

disastrous

adjective     /dɪˈzɑː.strəs/ US  /-ˈzæs.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.Accidents and disastersDifficult situations and unpleasant experiencesFailures disastrously     /-li/ adverb Things began to go disastrously wrong.Accidents and disastersDifficult situations and unpleasant experiencesFailures
(Definition of disastrous adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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