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Deadly synonyms

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Causing ruin or destruction; disastrous:
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  1. Causing ruin or destruction; disastrous:
  2. Very destructive; most unfortunate; disastrous
  3. Deadly, causing actual or metaphorical death; causing the undoing of a claim, assertion, or legal document (“a fatal flaw in the pleading”). See also fatal defect. Deadly, causing actual or metaphorical death; causing the undoing of a claim, assertion, or legal document (“a fatal flaw in the pleading”). See also fatal defect.
Capable of, guilty of, or intending murder:
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  1. Capable of, guilty of, or intending murder:
  2. (Informal) Very difficult, disagreeable, dangerous, trying, etc.
  3. (Informal) Capable of devastating or overwhelming:
Causing or capable of causing death; fatal or deadly
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  1. Causing or capable of causing death; fatal or deadly
  2. Extremely harmful; devastating:
Of a human being considered as a being who must eventually die
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  1. Of a human being considered as a being who must eventually die
  2. Relentlessly hostile; implacable:
  3. Liable or subject to death; not immortal:
Causing death; fatal.
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  1. Causing death; fatal.
  2. Like or characteristic of death
Containing sufficient poison to be dangerous
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  1. Containing sufficient poison to be dangerous
  2. Capable of harming or killing by poison:
  3. Harmful or destructive:
Of, affected by, or caused by a toxin, or poison
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  1. Of, affected by, or caused by a toxin, or poison
  2. Capable of causing injury or death, especially by chemical means; poisonous:
  3. Relating to or caused by a toxin or other poison:
Having a tendency to homicide; murderous
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  1. Having a tendency to homicide; murderous
  2. Of, having the nature of, or characterized by homicide
  3. Capable of or conducive to homicide:
Of, like, or containing blood
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  1. Of, like, or containing blood
  2. Involving bloodshed; with much killing or wounding
  3. Accompanied by or giving rise to bloodshed:
Harmful to the mind or morals; corrupting:
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  1. Harmful to the mind or morals; corrupting:
  2. Morally injurious; corrupting; unwholesome
  3. Harmful to living things; injurious to health:
Merely negative; not helpful
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  1. Merely negative; not helpful
  2. Causing or producing destruction; destroying
  3. Tending or likely to cause destruction
Malicious; spiteful:
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  1. Malicious; spiteful:
  2. Full of or containing venom:
  3. Harmful or destructive:
Harmful to health or well-being; injurious
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  1. Harmful to health or well-being; injurious
  2. Having a harmful effect; injurious:
  3. Harmful often in a subtle or unexpected way (as for example deleterious effects, deleterious to health).
Portending evil; ominous:
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  1. Portending evil; ominous:
  2. Miserable, wretched, distressed, suffering.
  3. Harmful or threatening harm or evil; ominous; deadly
  1. Harmful, malevolent, injurious.
  2. Causing or likely to cause death
  3. Very harmful, dangerous, or virulent
A position in a circuit or device at which a connection can be made or broken.
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  1. A position in a circuit or device at which a connection can be made or broken.
  2. (Computer Science) A device, often equipped with a keyboard and a video display, by which one can read, enter, or manipulate information in a computer system.
  3. Causing, ending in, or approaching death; fatal:
Able to overcome the natural defenses of the host; highly infectious
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  1. Able to overcome the natural defenses of the host; highly infectious
  2. (Med.) Violent and rapid in its course; highly malignant
  3. Characterized by, causing, or promoting the rapid onset of severe illness. Used of a disease or toxin.
Causing or tending to cause injury; harmful:
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  1. Causing or tending to cause injury; harmful:
  2. Offensive or insulting; hurtful:
  3. Injuring or likely to cause injury; harmful
Like or constituting a pestilence; widespread and deadly
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  1. Like or constituting a pestilence; widespread and deadly
  2. Of, causing, or likely to cause pestilence or infection
  3. Pernicious; dangerous; harmful
Morally evil or deadly; pernicious.
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  1. Morally evil or deadly; pernicious.
  2. Bringing or carrying disease
  3. (Informal) Annoying; mischievous; bothersome
Of, involving, or leading to suicide
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  1. Of, involving, or leading to suicide
  2. Rash to the point of being very dangerous
  3. Dangerous to oneself or to one's interests; self-destructive or ruinous:
Characterized by violence or carnage:
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  1. Characterized by violence or carnage:
  2. Eager to hurt or kill; murderous; very cruel
  3. Eager to cause or see the shedding of blood.
Used to describe something that endangers the continued life of the subject.
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  1. Used to describe something that endangers the continued life of the subject.
(Informal) Very funny or comical
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  1. (Informal) Very funny or comical
  2. Thoroughly exhausting:
  3. Causing or apt to cause death; fatal:
Portending harm; ominous.
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  1. Portending harm; ominous.
  2. Causing harm, ruin, or death; harmful.
(Rare) Wicked; evil
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  1. (Rare) Wicked; evil
  2. Causing great injury, destruction, or ruin; fatal; deadly
  3. Tending to cause death or serious injury; deadly:
Causing or able to cause harm; hurtful
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  1. Causing or able to cause harm; hurtful
  2. Causing or capable of causing harm; injurious.
Characterized by extreme emotion, especially anger:
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  1. Characterized by extreme emotion, especially anger:
  2. Causing or intending to cause damage, injury, or death, often when involving great force:
  3. Caused by unexpected force or injury rather than by natural causes:
Invariably occurring or appearing; predictable:
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  1. Invariably occurring or appearing; predictable:
  2. That cannot be avoided or evaded; certain to happen
For making holes
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  1. For making holes
  2. Uninteresting and tiresome; dull.
  3. Dull, tiresome, etc.
(Obsolete) Moving or progressing very slowly.
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  1. (Obsolete) Moving or progressing very slowly.
  2. Tiresome by reason of length, slowness, or dullness; boring.
  3. Full of tedium; long or verbose and wearisome; tiresome; boring
Causing fatigue or boredom, as from being unvarying or overly long; wearisome.
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  1. Causing fatigue or boredom, as from being unvarying or overly long; wearisome.
  2. Annoying; irksome
  3. Tiring; boring; tedious
Causing death; fatal.
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  1. Causing death; fatal.
  2. Like or characteristic of death
Concerning or determining one's fate:
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  1. Concerning or determining one's fate:
  2. Deadly, causing actual or metaphorical death; causing the undoing of a claim, assertion, or legal document (“a fatal flaw in the pleading”). See also fatal defect. Deadly, causing actual or metaphorical death; causing the undoing of a claim, assertion, or legal document (“a fatal flaw in the pleading”). See also fatal defect.
  3. Causing ruin or destruction; disastrous:
Extremely harmful; devastating:
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  1. Extremely harmful; devastating:
  2. Causing or capable of causing death; fatal or deadly
Conceivable; imaginable:
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  1. Conceivable; imaginable:
  2. Liable or subject to death; not immortal:
  3. Relentlessly hostile; implacable:
Used or done on a living cell or tissue:
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  1. Used or done on a living cell or tissue:
  2. Necessary to the continuation of life; life-sustaining:
  3. Concerned with or recording data pertinent to lives:
Suggestive of death; corpselike:
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  1. Suggestive of death; corpselike:
  2. Emaciated; gaunt:
  3. Of or like a cadaver; esp., pale, ghastly, or gaunt and haggard
Of, resembling, or characteristic of death:
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  1. Of, resembling, or characteristic of death:
  2. Like or characteristic of death
Horrible; frightful
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  1. Horrible; frightful
  2. Like a ghost in appearance; deathlike; pale; pallid; dismal.
  3. Causing shock, revulsion, or horror; terrifying:
Seemingly invisible; as a ghost, similar to a ghost.
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  1. Seemingly invisible; as a ghost, similar to a ghost.
Of or relating to the soul or spirit; spiritual.
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  1. Of or relating to the soul or spirit; spiritual.
  2. Of, like, or characteristic of a ghost; spectral
  3. Of, relating to, or resembling a ghost, a wraith, or an apparition; spectral.
Of or caused by a spectrum or spectra
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  1. Of or caused by a spectrum or spectra
  2. Of, relating to, or produced by a spectrum.
  3. Of, or pertaining to, spectra.
Portending harm; ominous.
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  1. Portending harm; ominous.
  2. Causing harm, ruin, or death; harmful.
Not benign; specif., cancerous
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  1. Not benign; specif., cancerous
  2. Harmful, malevolent, injurious.
  3. Tending to metastasize:
Harmful to the mind or morals; corrupting:
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  1. Harmful to the mind or morals; corrupting:
  2. Harmful to living things; injurious to health:
  3. Morally injurious; corrupting; unwholesome
(Rare) Wicked; evil
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  1. (Rare) Wicked; evil
  2. Causing great injury, destruction, or ruin; fatal; deadly
  3. Tending to cause death or serious injury; deadly:
Likely to cause death; deadly
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  1. Likely to cause death; deadly
  2. (Rare) Contagious; pestilential
  3. Causing or likely to cause epidemic disease:
  1. Producing pestilence or plague; pestilent
  2. Of, causing, or likely to cause pestilence or infection
  3. Pernicious; dangerous; harmful
Extremely poisonous or injurious; deadly
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  1. Extremely poisonous or injurious; deadly
  2. Extremely hostile or malicious:
  3. Characterized by, causing, or promoting the rapid onset of severe illness. Used of a disease or toxin.

Synonym Study

  • Lethal is applied to that which in its nature or purpose is a cause of death a lethal weapon, a lethal dose
  • Mortal implies that death has occurred or is about to occur and is applied to the immediate cause of death he has received a mortal blow
  • Fatal implies the inevitability or actual occurrence of death or disaster a fatal disease, a fatal mistake
  • Deadly is applied to a thing that can and probably (but not inevitably) will cause death a deadly poison
Find another word for deadly. In this page you can discover 63 synonyms, antonyms, idiomatic expressions, and related words for deadly, like: fatal, murderous, lethal, mortal, deathly, poisonous, toxic, homicidal, bloody, noxious and destructive.