a calamitous defeat.
a fatal series of events.
a fateful error.
it is fatal to enter any war without the will to win it.
such doctrines, if true, would be absolutely fatal to my theory.
that fateful meeting of the U.N. when...it declared war on North Korea.
the battle was a disastrous end to a disastrous campaign.
the fatal day of the election finally arrived.
the stock market crashed on Black Friday.