having momentous significance or consequences; decisively important; portentous

a fateful meeting between the leaders of the two countries.

fatal, deadly, or disastrous.

controlled or determined by destiny; inexorable.

prophetic; ominous.

adjective

insignificant , unimportant , healthful , healthy , life-giving

adjective

acute , apocalyptic , conclusive , critical , crucial , decisive , determinative , direful , doomful , eventful , important , inauspicious , momentous , ominous , portentous , resultful , calamitous , cataclysmic , catastrophic , destructive , disastrous , fatal , lethal , mortal , ruinous , cataclysmal , apocalyptical , baneful , dire , fire-and-brimstone , grave , hellfire , unlucky , deadly , inevitable , predestined , significant