DEADLY

adj. 1 lethal, fatal; dangerous, pernicious, poisonous, noxious, toxic; baleful, harmful, nocuous This drug is deadly if taken in large doses 2 mortal, implacable, ruthless, savage They were deadly enemies long after the war was over 3 murderous, homicidal, bloodthirsty, brutal, vicious, ferocious, barbarous, barbaric, savage, inhuman, cold-blooded, heartless, ruthless, pitiless, merciless Two deadly killers have escaped from Dartmoor prison 4 deathly, deathlike, pale, pallid, ghostly, cadaverous, ghastly, wan, white, livid, ashen He turned a deadly hue, as if he had seen a ghost 5 boring, excruciating, dull, tiresome, tedious, dreary, humdrum, lacklustre, wearying, wearisome It was a deadly play put on by deadly actors 6 exact, precise, accurate, true, unerring, unfailing Each arrow hit the bull's-eye with deadly accuracy