disastrous

[dih-zas-truhs, -zah-struhs]
adjective
1.
causing great distress or injury; ruinous; very unfortunate; calamitous: The rain and cold proved disastrous to his health.
2.
Archaic. foreboding disaster.

Origin:
1580–90; < Middle French desastreux, Italian disastroso. See disaster, -ous

disastrously, adverb
disastrousness, noun
nondisastrous, adjective
nondisastrously, adverb
nondisastrousness, noun
predisastrous, adjective
predisastrously, adverb
quasi-disastrous, adjective
quasi-disastrously, adverb
undisastrous, adjective
undisastrously, adverb
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World English Dictionary
disaster (dɪˈzɑːstə)
 
n
1.  an occurrence that causes great distress or destruction
2.  a thing, project, etc, that fails or has been ruined
 
[C16 (originally in the sense: malevolent astral influence): from Italian disastro, from dis- (pejorative) + astro star, from Latin astrum, from Greek astron]
 
dis'astrous
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

disastrous
1580s, from Fr. désastreux (16c.), from désastre (see disaster).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
However, the concern was for naught: the collider has been working without
  disastrous consequences.
Global warming is real, and the consequences are potentially disastrous.
Early efforts to curb that outbreak ranged from ineffective to disastrous.
Later a couple of horrid books and a disastrous interview stained his
  reputation.
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