1. Bringing death 
2. Having momentous consequences; of decisive importance
   "the fatal day of the election finally arrived"
   - fateful 
3. (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 
4. Controlled or decreed by fate; predetermined
   "a fatal series of events"
   - fateful

See also: deadly, deathly, decisive, fatality, fatally, inevitable, lethal, mortal, terminal, unfortunate

Antonym: nonfatal

Encyclopedia: Fatal

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