• WordNet 3.6
    • adj calamitous (of events) having extremely unfortunate or dire consequences; bringing ruin "the stock market crashed on Black Friday","a calamitous defeat","the battle was a disastrous end to a disastrous campaign","such doctrines, if true, would be absolutely fatal to my theory"- Charles Darwin","it is fatal to enter any war without the will to win it"- Douglas MacArthur","a fateful error"
    • ***
Webster's Revised Unabridged Dictionary
    • Calamitous Producing, or attended with distress and misery; making wretched; wretched; unhappy. "This sad and calamitous condition.""A calamitous prison"
    • Calamitous Suffering calamity; wretched; miserable. "Ten thousands of calamitous persons."
    • ***
Century Dictionary and Cyclopedia
    • calamitous Miserable; involved in calamity or deep distress; wretched.
    • calamitous Of the nature of or marked by calamity or great misfortune; bringing or resulting from calamity; making wretched; distressing or distressful: as, a calamitous event; “that calamitous prison,” Milton, S.A.,1. 1480; “this sad and calamitous condition,” South.
    • calamitous Synonyms Afflictive, disastrous, distressing, grievous, deplorable, baleful, ruinous.
    • ***
Chambers's Twentieth Century Dictionary
    • adj Calamitous making wretched, disastrous
    • ***


Webster's Revised Unabridged Dictionary
L. Calamitosus,; cf. F. calamiteux,
Chambers's Twentieth Century Dictionary
Fr. calamité—L. calamitat-em.


In literature:

In spite of the honesty of purpose of all those who followed the new way, the results were calamitous.
"The Head Voice and Other Problems" by D. A. Clippinger
One refractory inmate in ours would have been especially calamitous.
"The Atlantic Monthly, Volume 16, No. 96, October 1865" by Various
During those calamitous decades another great evil emerged as a result of the Union.
"Home Rule" by Harold Spender
A prey to afflicting thoughts, he remained for a while in that state of silent uncertainty which follows the receipt of calamitous news.
"The Tiger Hunter" by Mayne Reid
The truth is that the mass of our population has not sufficient surplus laid by to last over thirty days of such a calamitous interval.
"Frenzied Finance" by Thomas W. Lawson
I am doomed again to hear this ill-omened, this calamitous word!
"The Old Man of the Mountain, The Lovecharm and Pietro of Abano" by Ludwig Tieck
Alfred the Great was born at Wantage, in Berkshire, in the year 849, one of the most dreary and calamitous periods of English chronicle.
"Great Men and Famous Women. Vol. 3 of 8" by Various
Once or twice I have come in its way, but never willingly, and happily always without calamitous result.
"Blackwood's Edinburgh Magazine, Volume 61, No. 380, June, 1847" by Various
Suppose we use this calamitous forenoon to choose the shapes we are to crystallise into?
"The Crown of Wild Olive" by John Ruskin
The office had been rendered vacant by the calamitous explosion of a new monster gun on the U.S.S.
"A History of the Nineteenth Century, Year by Year" by Edwin Emerson

In poetry:

That the future's no calamitous change
But a malingering of now,
Histories, towns, faces that no
Malice or accident much derange.
"A Woman Unconscious" by Ted Hughes
Mr Past being no friends of mine,
all them around: Sir Future Dubious,
calamitous & grand:
I can no foothold here; wherefore I pines
for Dr Present, who won't thrive to us
hand over neither hand
"Dream Song 114: Henry in trouble whirped out lonely whines" by John Berryman

In news:

People, producing calamitous breathing problems.
Clinton warns Romney presidency would be ' calamitous '.
Paulson's Big Win and Calamitous Loss.
Romney would be ' calamitous ' for U.S. Register for E-mail alerts.
Romney would be ' calamitous ' for US.
Johnson's Calamitous Comment on Climate.
The Guild of Calamitous Intent (Profile).
Spawned out of a Radiohead tribute show two years ago, after winning over the audience with a version of "2 Plus 2 Equals 5," The Guild of Calamitous Intent was born.
Lorenzo Mauldin had absolutely nothing going for him, and that is not overselling the calamitous circumstances surrounding his childhood.
In 1933, four years after a calamitous market crash, Americans were losing hope.
Argentina to appeal NY debt ruling, invokes calamitous consequences for nations in crisis.
The lineup of parties interested in the bankruptcy of Nova Financial Holdings Inc provides a guide to the calamitous recent history of the defunct Berwyn banking firm.
Two new books from Chinese authors detail the calamitous consequences of China's Great Leap Forward.
Facebook's calamitous market debut also put the brakes on IPOs .
Some mandates are easily and obviously claimed, usually as an extension of calamitous events.

In science:

To see beautiful images obtained with polarised microscope of such transition, look at Ref. where mesophases of 1,4"-pterphenyl-bis-2,3,4-tri-dodecyloxy-benzal-imine are investigated. This is a calamitic compound with a biaxial nematic phase.
A survey of liquid crystalline oxadiazoles
There are of course biaxial-shaped calamitic materials, but ODBP boomerangs have a large electric dipole (≈ 4D), which adds the possibility of strong intermolecular association.
A survey of liquid crystalline oxadiazoles