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calamitous (adj.)

"marked by great misfortune," 1540s, from French calamiteux (16c.), from Latin calamitosus "causing loss, destructive; liable to damage or disaster," from calamitas (see calamity). Related: Calamitously; calamitousness.

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Definitions of calamitous from WordNet

calamitous (adj.)
(of events) having extremely unfortunate or dire consequences; bringing ruin; "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 calamitous defeat
Synonyms: black / disastrous / fatal / fateful
From wordnet.princeton.edu