blæk kəˈlæmɪtəs dɪˈzɑːstɹəs ˈfeɪtəl ˈfeɪtfəl controlled or decreed by fate; predetermined a fatal series of events having momentous consequences; of decisive importance that fateful meeting of the U.N. when … it declared war on North Korea the fatal day of the election finally arrived bringing death (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 it is fatal to enter any war without the will to win it a fateful error