1. (a.) Capable of causing death; mortal; fatal; destructive; certain or likely to cause death; as, a deadly blow or wound.

2. (a.) Aiming or willing to destroy; implacable; desperately hostile; flagitious; as, deadly enemies.

3. (a.) Subject to death; mortal.

4. (adv.) In a manner resembling, or as if produced by, death.

5. (adv.) In a manner to occasion death; mortally.

6. (adv.) In an implacable manner; destructively.

7. (adv.) Extremely.

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