Synonyms of fatal in English:

fatal


See definition of fatal

adjective

1‘a fatal disease’

SYNONYMS

deadly, lethal, mortal, causing death, death dealing, killing

final, terminal, incurable, untreatable, inoperable, malignant

tragic

literary deathly

archaic baneful

ANTONYMS

harmless, superficial

2‘don't make the fatal mistake of assuming others think as you do’

SYNONYMS

disastrous, devastating, ruinous, catastrophic, calamitous, cataclysmic, destructive, grievous, dire, crippling, crushing, injurious, harmful, costly

literary direful

ANTONYMS

harmless, beneficial