From The Collaborative International Dictionary of English v.0.44 [gcide]:
1. Capable of causing death; mortal; fatal; destructive; certain or likely to cause death; as, a deadly blow or wound.
2. Aiming or willing to destroy; implacable; desperately hostile; flagitious; as, deadly enemies.
Thy assailant is quick, skillful, and deadly. --Shak.
3. Subject to death; mortal. [Obs.]
The image of a deadly man. --Wyclif (Rom. i. 23).
{Deadly nightshade} (Bot.), a poisonous plant; belladonna. See under {Nightshade}.
From The Collaborative International Dictionary of English v.0.44 [gcide]:
1. In a manner resembling, or as if produced by, death; deathly. ''Deadly pale.'' --Shak.
2. In a manner to occasion death; mortally.
The groanings of a deadly wounded man. --Ezek. xxx. 24.
3. In an implacable manner; destructively.
4. Extremely. [Obs.] ''Deadly weary.'' --Orrery. ''So deadly cunning a man.'' --Arbuthnot.
From WordNet (r) 2.0 [wn]:
adjective
1: causing or capable of causing death; "a fatal accident"; "a deadly enemy"; "mortal combat"; "a mortal illness" [syn: {deathly}, {mortal}]
2: of an instrument of certain death; "deadly poisons"; "lethal weapon"; "a lethal injection" [syn: {lethal}]
3: extremely poisonous or injurious; producing venom; "venomous snakes"; "a virulent insect bite" [syn: {venomous}, {virulent}]
4: involving loss of divine grace or spiritual death; "the seven deadly sins" [syn: {mortal(a)}]
5: exceedingly harmful [syn: {baneful}, {pernicious}, {pestilent}]
6: (of a disease) having a rapid course and violent effect
adverb
1: as if dead [syn: {lifelessly}]
2: as if produced by death; "deadly pale"; "a deadly paralytic stroke"
3: (used as intensives) extremely; "she was madly in love"; "deadly dull"; "deadly earnest"; "deucedly clever"; "insanely jealous" [syn: {madly}, {insanely}, {deucedly}, {devilishly}] [also: {deadliest}, {deadlier}]
From Moby Thesaurus II by Grady Ward, 1.0 [moby-thes]:
213 Moby Thesaurus words for "deadly": a la mort, abominably, accurate, agonizingly, ashen, awful, awfully, baldly, baleful, balefully, baneful, barbaric, barbarous, bitterly, blatantly, bloodthirsty, blue, boring, brashly, brutal, cadaverous, calamitous, cataclysmal, cataclysmic, catastrophic, catching, cold-blooded, communicable, confoundedly, consuming, consumptive, contagious, corpselike, corroding, corrosive, corrupting, corruptive, counterproductive, cruelly, damaging, damnably, dangerous, dead, deadened, death-bringing, deathful, deathlike, deathly, deathly pale, deleterious, demolishing, demolitionary, depredatory, desolating, destroying, destructive, detrimental, deucedly, devastating, disadvantageous, disastrous, disserviceable, distressing, distressingly, dolorously, doomful, dreadful, dreadfully, dreary, dull, eerie, egregiously, envenomed, exact, excessively, excruciating, excruciatingly, exorbitantly, extravagantly, fatal, fateful, fearful, feral, ferocious, flagrantly, fratricidal, frightful, frightfully, ghastly, ghostlike, ghostly, grievously, grisly, gruesome, haggard, harmful, heartless, hellishly, homicidal, horrible, horribly, howling, humdrum, hurtful, implacable, improperly, inexcusably, infectious, infective, infernally, inhuman, injurious, inordinately, internecine, intolerably, killing, lamentably, lethal, livid, lurid, macabre, malefic, malevolent, malign, malignant, mephitic, merciless, miasmal, miasmatic, miasmic, mischievous, miserably, mortal, mortuary, murderous, nakedly, nihilist, nihilistic, noisome, noxious, ominous, openly, painfully, pale, pallid, pernicious, pestiferous, pestilent, pestilential, piteously, pitiless, poisonous, precise, prejudicial, ravaging, rousing, ruining, ruinous, ruthless, sadly, savage, scatheful, self-destructive, shatteringly, shockingly, slaying, something awful, something fierce, sorely, staggeringly, subversionary, subversive, suicidal, tedious, terrible, terribly, terrific, thumping, tiresome, to the death, torturously, toxic, toxicant, toxiferous, true, unashamedly, unbearably, uncanny, unconscionably, unduly, unearthly, unerring, unfailing, unpardonably, vandalic, vandalish, vandalistic, venenate, veneniferous, venenous, venomous, vicious, virulent, wan, wasteful, wasting, wearisome, wearying, weird, whacking, white, withering, woefully
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