Definition of Fatal

Adjective: fatal fey-t(u)l

Bringing death
Having momentous consequences; of decisive importance
"the fatal day of the election finally arrived";
- fateful
(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";
- black, calamitous, disastrous, fateful
Controlled or decreed by fate; predetermined
"a fatal series of events";
- fateful