causing or capable of causing death; mortal; deadly

a fatal accident; a fatal dose of poison.

causing destruction, misfortune, ruin, or failure

The withdrawal of funds was fatal to the project.

decisively important; fateful

The fatal day finally arrived.

proceeding from or decreed by fate; inevitable

a fatal series of events.

influencing or concerned with fate; fatalistic.

Obsolete . doomed.

Obsolete . prophetic.

adjective

healthful , life-giving , nourishing , vital , wholesome , trivial , unimportant , unnecessary

adjective

baleful , baneful , calamitous , cataclysmic , catastrophic , deathly , destructive , disastrous , fateful , final , ill-fated , ill-starred , incurable , inevitable , killing , malefic , malignant , mortal , mortiferous , noxious , pernicious , pestilent , pestilential , poisonous , ruinous , terminal , virulentnotes:use fatal for something which has caused someone\'s death; use lethal for something which is capable of killing someone , crucial , decisive , destined , determining , doomed , foreordained , predestined , unluckynotes:use fatal for something which has caused someone\'s death; use lethal for something which is capable of killing someone , momentous , lethal , vital , cataclysmal , critical , deadly , feral , lethiferous , malicious