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disastrous (adj.)

1580s, "ill-starred, unlucky," a sense now obsolete, from French désastreux (16c.), which is from désastre (see disaster) or else from Italian desastroso. The modern meaning "calamitous, ruinous, of the nature of a disaster," is from c. 1600. Related: Disastrously; disastrousness.

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Definitions of disastrous from WordNet

disastrous (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;
the battle was a disastrous end to a disastrous campaign
Synonyms: black / calamitous / fatal / fateful
From wordnet.princeton.edu