Synonyms of deadly in English:

deadly


See definition of deadly

adjective

1‘certain mixtures of drugs can be deadly’

SYNONYMS

fatal, lethal, mortal, death-dealing, life-threatening

dangerous, destructive, injurious, harmful, pernicious, detrimental, deleterious, unhealthy

noxious, toxic, poisonous

terminal, incurable, untreatable, malignant

literary deathly, nocuous, mephitic

archaic baneful

ANTONYMS

harmless, beneficial

2‘the two men rapidly became deadly enemies’

SYNONYMS

mortal, irreconcilable, implacable, remorseless, relentless, unrelenting, unappeasable, unforgiving, merciless, pitiless

bitter, hostile, antagonistic, murderous, fierce, grim, savage

informal at each other's throats

3‘I noted their deadly seriousness’

SYNONYMS

intense, great, marked, extreme, excessive, immoderate, inordinate

ANTONYMS

mild

4‘he was deadly pale and too weak to speak’

SYNONYMS

deathly, deathlike, ashen, ghostly, white, pallid, wan, pale, ghastly

5‘his aim is deadly’

SYNONYMS

unerring, unfailing, impeccable, perfect, flawless, faultless, assured, sure, true, precise, accurate, correct, exact, direct, on target, on the mark

British inch-perfect

British informal spot on, bang on

vulgar slang shit hot

ANTONYMS

poor, inaccurate

6‘life in a small village can be deadly’

See boring

adverb

1‘her voice was deadly calm’

SYNONYMS

completely, absolutely, totally, utterly, perfectly, entirely, wholly, fully, quite, dead, thoroughly

in every way, in every respect, in all respects, one hundred per cent, every inch, to the hilt, to the core