Definition of fatal
(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"