deadly

¹dead·ly

adjective \ˈded-lē\

dead·li·erdead·li·est

Definition of DEADLY

1

: likely to cause or capable of producing death <deadly poison>

2

a : aiming to kill or destroy : implacable <a deadly enemy>

b : highly effective <a deadly exposé>

c : unerring <a deadly marksman>

d : marked by determination or extreme seriousness

3

a : tending to deprive of force or vitality <a deadly habit>

b : suggestive of death especially in dullness or lack of animation <deadly bores> <a deadly conversation>

4

: very great : extreme

— dead·li·ness noun

Examples of DEADLY

1. the world's most deadly snake
2. a more deadly form of the disease
3. They launched a deadly attack.
4. Officers are allowed to use deadly force if necessary.
5. She shoots with deadly accuracy.
6. a basketball player with deadly aim
7. A deadly silence followed his question.
8. The two gang leaders are deadly enemies.
9. He spoke with deadly seriousness.

First Known Use of DEADLY

before 12th century

Related to DEADLY

Synonyms

baleful, deathly, fatal, fell, killer, lethal, mortal, murderous, pestilent, terminal, vital

Antonyms

healthful, healthy, nonfatal, nonlethal, wholesome

Related Words

baneful, deleterious, destructive, harmful, injurious, noxious, pernicious, truculent; infectious, infective, pestilential, poisonous, sublethal, toxic, virulent; dangerous, grave, grievous, hazardous, jeopardizing, menacing, parlous, perilous, risky, serious, threatening, ugly, unhealthy, unsound; bloody, internecine, sanguinary, sanguine

Near Antonyms

beneficial, restorative, salubrious, salutary; alleviative, corrective, curative, remedial, tonic; advantageous, beneficial, useful; nonpoisonous, nontoxic, safe

Synonym Discussion of DEADLY

deadly, mortal, fatal, lethal mean causing or capable of causing death. deadly applies to an established or very likely cause of death <a deadly disease>. mortal implies that death has occurred or is inevitable <a mortal wound>. fatal stresses the inevitability of what has in fact resulted in death or destruction <fatal consequences>. lethal applies to something that is bound to cause death or exists for the destruction of life <lethal gas>.

Rhymes with DEADLY

medley, redly

²deadly

adverb

Definition of DEADLY

1

archaic : in a manner to cause death : mortally

2

: suggesting death

3

: extremely <deadly serious>

Examples of DEADLY

1. <I'm deadly serious about making an offer on the house.>

First Known Use of DEADLY

before 12th century

Related to DEADLY

Synonyms

achingly, almighty, archly, awful, awfully, badly, beastly, blisteringly, bone, colossally, corking, cracking, damn, damned, dang, very, desperately, eminently, enormously, especially, ever, exceedingly (also exceeding), extra, extremely, fabulously, fantastically, far, fiercely, filthy, frightfully, full, greatly, heavily, highly, hugely, immensely, incredibly, intensely, jolly, majorly, mightily, mighty, monstrous [chiefly dialect], mortally, most, much, particularly, passing, rattling, real, really, right, roaring, roaringly, seriously, severely, so, sore, sorely, spanking, specially, stinking, such, super, supremely, surpassingly, terribly, that, thumping, too, unco, uncommonly, vastly, vitally, way, whacking, wicked, wildly

Antonyms

little, negligibly, nominally, slightly, somewhat

Related Words

absolutely, altogether, completely, downright, entirely, flat-out, fully, positively, purely, radically, thoroughly, totally, utterly, wholly; deeply, profoundly; exceptionally, notably, remarkably; considerably, extensively, significantly, substantially; appreciably, discernibly, markedly, noticeably, obviously, palpably, plainly, visibly; abundantly, plentifully; astronomically, grandly, monstrously, monumentally; excessively, obscenely, overmuch; amazingly, astonishingly, staggeringly

Near Antonyms

meagerly, scantily; barely, hardly, just, marginally, minimally, scarcely

dead·ly

adjective \ˈded-lē\   (Medical Dictionary)

dead·li·er; dead·li·est

Medical Definition of DEADLY

: likely to cause or capable of causing death <a deadly disease> <a deadly poison> <a deadly instrument>

—dead·li·ness \-nəs\ (audio pronunciation) noun