(adj) (of events) having extremely unfortunate or dire consequences; bringing ruin; ; ; ; - Charles Darwin; - Douglas MacArthur, Syn. disastrous, calamitous, fateful, fatal, Example: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; it is fatal to enter any war without the will to win it; a fateful error
The Collaborative International Dictionary of English (GCIDE) v.0.53 Collaborative International Dictionary (GCIDE)
Ten thousands of calamitous persons. South. [ 1913 Webster ]
2. Producing, or attended with distress and misery; making wretched; wretched; unhappy. “This sad and calamitous condition.” South. “A calamitous prison” Milton.