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calamitous

[kuh-lam-i-tuh s]
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adjective
  1. causing or involving calamity; disastrous: a calamitous defeat.

Origin of calamitous

First recorded in 1535–45; calamit(y) + -ous
Related formsca·lam·i·tous·ly, adverbca·lam·i·tous·ness, nounun·ca·lam·i·tous, adjectiveun·ca·lam·i·tous·ly, adverb

Synonyms

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catastrophic, ruinous, devastating.

Antonyms

beneficial, advantageous.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for calamitous

calamitous

adjective
  1. causing, involving, or resulting in a calamity; disastrous
Derived Formscalamitously, adverbcalamitousness, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for calamitous

adj.

1540s, from French calamiteux (16c.), from Latin calamitosus "causing loss, destructive," from calamitas (see calamity). Related: Calamitously; calamitousness.

Online Etymology Dictionary, © 2010 Douglas Harper