FATAL

adj. 1 fateful, deadly, murderous, lethal, mortal, toxic, terminal, final; baneful, poisonous She drank the fatal potion without a word Who dealt the fatal blow? 2 destructive, fateful, ruinous, calamitous, dreadful, disastrous, devastating, cataclysmic, catastrophic, harmful, mischievous, damaging Discovery by the police would prove fatal to our plan 3 fateful, fated, destined, predestined, decreed, ordained, foreordained, preordained, predetermined, inevitable, unavoidable, necessary, essential, inescapable, ineluctable The events fell into their fatal sequence