fatal

adjective

1. 1

   controlled or decreed by fate; predetermined

   a fatal series of events

2. 2

   having momentous consequences; of decisive importance

   that fateful meeting of the U.N. when...it declared war on North Korea"- Saturday Rev

   the fatal day of the election finally arrived

3. 3

   bringing death

4. 4

   (of events) having extremely unfortunate or dire consequences; bringing ruin

   the stock market crashed on Black Friday

   a calamitous defeat