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Adjective: fatal  fey-t(u)l
  1. Bringing death
    - killing
  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, inevitable, lethal, mortal, terminal, unfortunate

Antonym: nonfatal

Encyclopedia: Fatal