UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/kəˈlæmɪtəs/US:USA pronunciation: respellingUSA pronunciation: respelling(kə lami təs)

WordReference Random House Unabridged Dictionary of American English © 2020
ca•lam•i•tous  (kə lami təs),USA pronunciation adj. 
  1. causing or involving calamity;
    disastrous:a calamitous defeat.
ca•lami•tous•ly, adv. 
ca•lami•tous•ness, n. 
  • calamit(y) + -ous 1535–45
    catastrophic, ruinous, devastating.
    beneficial, advantageous.

Collins Concise English Dictionary © HarperCollins Publishers::
calamitous /kəˈlæmɪtəs/ adj
  1. causing, involving, or resulting in a calamity; disastrous
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