/ dɪˈzɑːstrəs; NAmE -ˈzæs-/ adjective
very bad, harmful or unsuccessful
SYN catastrophic , devastating :
a disastrous harvest / fire / result
Lowering interest rates could have disastrous consequences for the economy.
► dis·as·trous·ly adverb :
How could everything go so disastrously wrong?
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WORD ORIGIN
late 16th cent. (in the sense ill-fated ): from French désastreux , from Italian disastroso , from disastro disaster.