Fatal

adjective

'feɪtəl

Adjective

(of events) having extremely unfortunate or dire consequences; bringing ruin
“such doctrines, if true, would be absolutely fatal to my theory”
“it is fatal to enter any war without the will to win it”
Similar:BlackCalamitousDisastrousFateful
controlled or decreed by fate; predetermined
“a fatal series of events”
Similar:Fateful
having momentous consequences; of decisive importance
“the fatal day of the election finally arrived”
Similar:Fateful
bringing death