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

 

calamitous

 adjective
adjective
BrE BrE//kəˈlæmɪtəs//
 
; NAmE NAmE//kəˈlæmɪtəs//
 
(formal)
 
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causing great damage to people’s lives, property, etc. synonym disastrous The bridge collapsed in the storm, with calamitous results.
See the Oxford Advanced American Dictionary entry: calamitous