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Textual thesaurus for "calamitous"

(adj) black, fatal, fateful, disastrous

(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