Definition of disastrous adjective from the Oxford Advanced Learner's Dictionary

 

disastrous

 adjective
adjective
BrE BrE//ˈzɑːstrəs//
 
; NAmE NAmE//ˈzæstrəs//
 
 
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very bad, harmful or unsuccessful synonym catastrophic, devastating a disastrous harvest/fire/result Lowering interest rates could have disastrous consequences for the economy. It was a disastrous start to the season for the team. Word Origin late 16th cent. (in the sense ‘ill-fated’): from French désastreux, from Italian disastroso, from disastro ‘disaster’.Extra examples This could have equally disastrous consequences. The church was rebuilt after a disastrous fire in 1824. The war ended in 1815 but was followed by a series of disastrous harvests.
See the Oxford Advanced American Dictionary entry: disastrous