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[dih-zas-truh s, -zah-struh s] /dɪˈzæs trəs, -ˈzɑ strəs/
causing great distress or injury; ruinous; very unfortunate; calamitous:
The rain and cold proved disastrous to his health.
Archaic. foreboding disaster.
Origin of disastrous
1580-90; < Middle French desastreux, Italian disastroso. See disaster, -ous
Related forms
disastrously, adverb
disastrousness, noun
nondisastrous, adjective
nondisastrously, adverb
nondisastrousness, noun
predisastrous, adjective
predisastrously, adverb
quasi-disastrous, adjective
quasi-disastrously, adverb
undisastrous, adjective
undisastrously, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for disastrous
Contemporary Examples
Historical Examples
  • The battle was disastrous for the Egyptians and the valley of the Nile was open to the invaders.

    Ancient Man Hendrik Willem van Loon
  • Was ever a man placed, he thought, in a position so inextricable, so disastrous?

    Malbone Thomas Wentworth Higginson
  • It is natural to goodness and innocence, but not the less is the error a disastrous one.

    Weighed and Wanting George MacDonald
  • Do not let this great and disastrous fall sink you into lower depths of sin.

    Life in London Edwin Hodder
  • Crane's racing season had been as successful as the Master of Ringwood's had been disastrous.

    Thoroughbreds W. A. Fraser
Word Origin and History for disastrous

1580s, "ill-starred," from French désastreux (16c.), from désastre (see disaster) or from Italian desastroso. Meaning "calamitous" is from c.1600. Related: Disastrously.

Online Etymology Dictionary, © 2010 Douglas Harper
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