Definition of calamitous adjective from the Oxford Advanced American Dictionary

     

    calamitous

     adjective
    adjective
    NAmE//kəˈlæmət̮əs//
     
    (formal)
     
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  1. 1causing great damage to people's lives, property, etc. synonym disastrous
  2. 2 The bridge collapsed in the storm, with calamitous results.
See the Oxford Advanced Learner's Dictionary entry: calamitous