ca·lam·i·tous

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

Origin:
1535–45; calamit(y) + -ous

ca·lam·i·tous·ly, adverb
ca·lam·i·tous·ness, noun
un·ca·lam·i·tous, adjective
un·ca·lam·i·tous·ly, adverb


catastrophic, ruinous, devastating.


beneficial, advantageous.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
Cite This Source Link To calamitous
Collins
World English Dictionary
calamitous (kəˈlæmɪtəs) [Click for IPA pronunciation guide]
 
adj
causing, involving, or resulting in a calamity; disastrous
 
ca'lamitously
 
adv
 
ca'lamitousness
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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00:10
Calamitous is always a great word to know.
So is bezoar. Does it mean:
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
Etymonline
Word Origin & History

calamitous
1540s, from Fr. calamiteux (16c.), from L. calamitosus "causing loss, destructive," from calamitas (see calamity).
Online Etymology Dictionary, © 2010 Douglas Harper
Cite This Source
Example sentences
The common denominator of working here is change--constant, even calamitous at
  times, but vibrant.
At first, this development seemed more curious than calamitous.
In retrospect, it is not possible to point to any single factor that
  precipitated the calamitous events of this period.
However, drastic cuts to the defense budget would have calamitous and
  long-lasting consequences.
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