Definition of deadly in English:

deadly

adjective

  • 1Causing or able to cause death.

    ‘a deadly weapon’
    ‘a series of deadly attacks’
    • ‘In Doomsday Book the twenty-first century is stricken by yet another pandemic, almost as deadly as the Black Death was in the fourteenth.’
    • ‘Agent Orange contained dioxins, which are some of the most deadly poisons known.’
    • ‘The 2003 death toll from the deadly virus was only one.’
    • ‘Greed is their most deadly sin, because none of them can escape it.’
    • ‘New intelligence indicates explosives set off to the side of the road are proving very deadly.’
    • ‘It feels as if only the ultimate extinction of the human race will able to stop that deadly spiral.’
    • ‘But in the latest two-week period, seven chickens tested positive for the potentially deadly virus.’
    • ‘They help to prevent more deadly diseases from affecting your pet.’
    • ‘The aftershock is equally deadly for those who live in the vicinity.’
    • ‘It is also important to remember that every driver on the highway is armed with a weapon more deadly and dangerous than any firearm: a motor vehicle.’
    • ‘The director of Amnesty International UK has appealed to the people of west Wiltshire to support the charity's campaign against the worldwide trade in deadly weapons.’
    • ‘He faces charges of assault with a deadly weapon.’
    • ‘And in doing so there's a distinct possibility that deadly force will have to be used.’
    • ‘British leaders say the mistaken shooting last Friday was a tragedy, but they insist police must be able to use deadly force to protect the public.’
    • ‘Asthma is at best an annoying condition, and at worst a debilitating, even deadly disease.’
    • ‘Now the fire itself wasn't very deadly, it was the smoke.’
    • ‘The gas was refined and is less toxic but still toxic enough to be deadly to humans over time.’
    • ‘Scientists hope new research could result in a vaccine for the potentially deadly meningitis B virus.’
    • ‘Tobacco is ' one of the most deadly poisons'.’
    • ‘Big SUVs and little kids, a dangerous and sometimes deadly combination in the family driveway.’
    fatal, lethal, mortal, death-dealing, life-threatening
    View synonyms
    1. 1.1 Filled with hatred or intense rivalry.
      ‘we are deadly enemies’
      ‘his voice was cold and deadly’
      • ‘His voice was deadly and calm as he walked toward them.’
      • ‘Some were related; some were colleagues and friends; others were deadly enemies.’
      • ‘An unearthly calm seemed to come over him then, and there was a feeling of deadly malice, of hate and violence radiating from him that made her flinch from his stare.’
      • ‘"You killed her, " Amy said her voice deadly and unforgiving.’
      • ‘Tommy glanced at her face in complete shock and finally received an expression, a deadly one.’
      • ‘Whipping around her skirt, it pulled her auburn hair away from her face, somehow making her look beautiful and deadly all in one moment.’
      • ‘The nation is at war against deadly enemies.’
      • ‘Their hate campaign is paying deadly dividends.’
      • ‘Voice hated Azrael with a deadly passion.’
      • ‘They are murderous, they are frustrated and they are deadly.’
      • ‘Her tone was flat and deadly, her fingers curled stiffly into something like claws.’
      • ‘His eyes filled with cold, deadly venom, and a short snarl escaped his lips.’
      • ‘Barth said without thinking, looking wretchedly into the beautiful deadly face, hating her for smiling, and not being the empress.’
      • ‘The two men, who were once close allies but are now deadly enemies, are sharing the same hotel in Seoul.’
      • ‘The greatest tragedy of the overseas democratic movement is that your ‘own people’ are often your most deadly enemy.’
      • ‘Grant projects a steady threat of violence, as though he could go over the edge from debonair to deadly at any moment.’
      mortal, irreconcilable, implacable, remorseless, relentless, unrelenting, unappeasable, unforgiving, merciless, pitiless
      View synonyms
    2. 1.2 Extremely accurate, effective, or skilful.
      ‘his aim is deadly’
      • ‘He is hilarious when he plays a woman, because he nails it with deadly accuracy.’
      • ‘He throws the ball straight with deadly accuracy.’
      • ‘He charges like a mad man, swinging wildly yet very deadly and quite accurate.’
      • ‘You rely on body armor, luck, and your deadly accuracy to survive.’
      • ‘Tyger threw the ball with deadly accuracy right at the monster's chest.’
      • ‘And because I came from a single-income family, I was eligible for a student allowance, even with the deadly radar of means-testing.’
      • ‘Each strike and block was performed with flawless, deadly accuracy.’
      • ‘A flat free-kick of typically deadly pace from David Beckham brushed the head of the Paraguay captain Carlos Gamarra and continued on its path to the net.’
      • ‘Hinting at the timepiece's capacity for deadly accuracy, he adds: ‘It was twenty-four minutes past midnight.’’
      • ‘Kendal's third and fourth goals also came from penalty corners again from Brooks, who dispatched accurately positioned balls with deadly accuracy.’
      • ‘Not an International, but proving deadly in the Premiership whilst his form lasts.’
      • ‘The one warrior, though not being nearly as powerful as the other, was quite quick and her fighting style deadly.’
      • ‘Practice this in front of a mirror until you can slightly part your lips and silently hit a target with deadly accuracy.’
      • ‘Taking aim she hurled her daggers at her enemy with deadly precision.’
      • ‘There's something scary about a spare ball that can look this good and be so deadly.’
      unerring, unfailing, impeccable, perfect, flawless, faultless, assured, sure, true, precise, accurate, correct, exact, direct, on target, on the mark
      View synonyms
    3. 1.3attributive Complete; total.
      ‘she was in deadly earnest’
      • ‘After a moment of deadly silence, the general spoke.’
      • ‘There are things of deadly earnest that can only be mentioned under the cover of a joke.’
      • ‘This is a continuous blast, until the eye of the hurricane reaches you and you get half and hour or so of deadly quietness.’
      • ‘Morgan Freeman was now speaking in deadly earnest about Rainforests as the Lungs of Our Planet.’
      • ‘There was a moment of deadly calm before people began to move, soft moans of pain from all around.’
      • ‘Byron may have been playing at soldiers, but at the same time he was in deadly earnest.’
      • ‘Let us take this issue with the deadly seriousness that it deserves -- not only on this International Day, but every day.’
      intense, great, marked, extreme, excessive, immoderate, inordinate
      completely, absolutely, totally, utterly, perfectly, entirely, wholly, fully, quite, dead, thoroughly
      View synonyms
    4. 1.4British informal Extremely boring.
      ‘my end of the theatre is deadly at the moment’
      • ‘Viewers today typically consider busts academic, boring, deadly; in a museum, they are what you walk past on the way to the Impressionists.’
      • ‘"I only joined because of my mother," Chris tells her friend Annie after they've snickered through another deadly lecture on broccoli or carpet.’
      • ‘I barely even notice the battle anymore through the deadly monotony.’
      • ‘As a result, cultural choice is increasingly restricted, and a bland sameness, deadly and soporific, threatens the cultural landscape.’
      • ‘Bemused glances helped them get through that deadly sermon.’
      • ‘Quiet filled the long, deadly moments that Abigail and James Corinne spent simply gawking at Callie.’
      boring, dull, dull as ditchwater, dreary, uninteresting, unexciting, uneventful, uninspiring, unstimulating, humdrum, lacklustre, dry, dry as dust, arid, flat, bland, monotonous, unrelieved, lacking variety, lacking variation, tedious, tiresome, tiring, wearisome, irksome, trying, frustrating, mind-numbing, soul-destroying
      View synonyms
  • 2Irish Australian informal Very good; excellent.

    ‘it's a great town and the pubs are deadly’
    • ‘Breakfast was deadly!! The best breakfast potatoes I think I’ve ever had.’
    • ‘Just like to say it was deadly today. Had great fun.’

adverb

  • 1as submodifier In a way resembling or suggesting death; as if dead.

    ‘her skin was deadly pale’
    • ‘I lay deadly still and tried to listen for a sound to give me a clue to where I was, but all I could hear was my own erratic breathing.’
    • ‘His face was deadly white, a bloody bandage swathed his neck, and his rainproof was soaked with the blood of a sniper's victim.’
    • ‘All the while being deadly silent, since I live with my grandmother and her bedroom is right next to the bathroom.’
    • ‘The party mood was gone and everyone was deadly quiet.’
    deathly, deathlike, ashen, ghostly, white, pallid, wan, pale, ghastly
    View synonyms
    1. 1.1 Extremely.
      ‘a deadly serious remark’
      • ‘It is a deadly dull subject, almost guaranteed to drive away both voters and readers.’
      • ‘I mean, even the last book I read was so deadly dull I had to skim the last third just to get it over with.’
      • ‘Bing Crosby was deadly afraid of heights.’
      • ‘But there are other worthy contenders too - deadly fast men such as Holding and Walsh, and artful slow bowlers like Ramadhin and Gibbs.’
      • ‘On the one hand, a nightmarish reality; on the other, a deadly boring dream.’
      • ‘It's been a long and busy day, and the weather has been deadly dull and grey.’
      • ‘The Gunners had the most disastrous of starts, conceding a goal to the deadly dangerous John O'Brien inside a minute and going four points behind with just ninety seconds on the clock.’
      • ‘In particular, the host, Killian, feels that he would be the perfect contestant on the deadly popular show.’
      • ‘Every inch the deadly precise aristocrat, Harris shines brighter than any other star in Enemy at the Gates.’
      • ‘It is journalistic slop, political flatulence and religious aggrandisement, and it is deadly dangerous.’
      • ‘‘I had the chance to sell to Honda, but I was deadly determined to do it on my own at that stage and that was '97,’ he said.’
      • ‘This joking remark caused Eisenhower to turn deadly serious.’
      • ‘"Let me tell you something, " Christian continued, his voice deadly soft.’
      • ‘Not even that deadly cute Lulu Guinness I saw at Nordie's.’
      • ‘She should still feign indifference in the entire matter, no matter how deadly curious she was.’
      • ‘Heart failure is a deadly serious condition, but with good treatments people can double or triple their life expectancy.’
      • ‘They are a deadly efficient machine, especially locally.’
      • ‘Elves are that way though, jolly one moment and deadly serious when the situation needs it.’
      • ‘This is not something I've ever done and I'm deadly uncomfortable with conflict, always have been, so this is quite a stretch.’
      • ‘The system at Dachau was simple, but deadly effective.’
      extremely, exceedingly, enormously, vastly, immensely, tremendously, hugely, markedly, remarkably, abundantly, deadly, awfully, dreadfully, mightily, very, very much, most, so, to a great extent
      View synonyms

Origin

Old English dēadlīc ‘mortal, in danger of death’ (see dead, -ly).

Pronunciation

deadly

/ˈdɛdli/