Englishdeadly
adjective
1 certain mixtures of drugs can be deadly | a deadly disease:
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:
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:
intense, great, marked, extreme, excessive, immoderate, inordinate.
▷antonyms mild.
4 he was deadly pale and too weak to speak:
deathly, deathlike, ashen, ghostly, white, pallid, wan, pale, ghastly.
5 his aim is deadly:
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 informal life in a small village can be deadly:
boring, dull, dull as ditchwater, dreary, uninteresting, unexciting, uneventful, uninspiring, unstimulating, humdrum, lackluster, dry, dry as dust, arid, flat, bland, monotonous, unrelieved, lacking variety, lacking variation, tedious, tiresome, tiring, wearisome, irksome, trying, frustrating, mind-numbing, soul-destroying;
informal no great shakes, not up to much, nothing to write home about;
British, informal samey;
North American, informal dullsville, ornery.
▷antonyms exciting.