Deadly synonyms and antonyms

dĕd'lē

(Computing) Causing a sudden end to the running of a program.

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The definition of lethal is something very harmful or destructive, especially something that could cause death.

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Causing or likely to cause death

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(Informal) Capable of devastating or overwhelming:

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Acting as a poison; poisonous

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Having a tendency to homicide; murderous

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Malignant; spiteful; malicious

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Covered in blood.

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Appearing as though dead, or on the verge of death.

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The definition of noxious is something very unpleasant or something poisonous.

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Susceptible to death by aging, sickness, injury, or wound; not immortal. [from 14th c.]

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Containing sufficient poison to be dangerous

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Causing destruction; damaging.

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Harmful often in a subtle or unexpected way (as for example deleterious effects, deleterious to health).

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Dreadful; appalling

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Miserable, wretched, distressed, suffering.

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(Chiefly medicine, of a disease or disease-causing agent) Highly infectious, malignant, or deadly.

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Causing or tending to cause cancer.

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dangerous (related)

Full of danger; likely to cause injury, pain, etc.; unsafe; perilous

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reviving (antonym)

Causing death

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lethiferous

(Obsolete) Deadly, lethal.

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The definition of pernicious is deadly or very destructive.

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(Illness): Fatal; resulting in death.

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healthful (antonym)

(Rare) healthy

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beneficial (antonym)

Producing or promoting a favorable result; advantageous:

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dull (related)

Arousing little interest; lacking liveliness; boring:

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The definition of dire is something so bad or scary that it causes distress or terror.

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death-dealing

Causing death

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The definition of tiresome is something tedious, boring or exceedingly dull.

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Very bad; lousy.

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brutal (related)

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Causing harm to one's reputation; slanderous, libelous, invidious.

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Producing pestilence or plague; pestilent

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Morally evil or deadly; pernicious.

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(Informal) Extremely reckless.

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Characterized by massive bloodshed.

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Tending toward cannibalism.

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life-threatening

Used to describe something that endangers the continued life of the subject.

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Deadly or sinister.

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Causing or able to cause harm; hurtful

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Very forceful:

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Boring, monotonous, time consuming, wearisome.

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Participating or tending to participate in a very dangerous or difficult sport:

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Of, like, or characteristic of a ghost; spectral

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Not able to be placated or appeased.

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Mutually destructive; most often applied to warfare.

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(Archaic) Annoying; troublesome

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Bringing or tending to bring ruin; very destructive or harmful; disastrous

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Having or showing no pity; merciless; relentless

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Without mercy or compassion

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harmless (antonym)

Not giving rise to legal liability:

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healthy (antonym)

Sizable; considerable:

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wholesome (antonym)

Characterized by health and vigor of mind and body; specif., morally sound

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animating (antonym)

causing end of life

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invigorating (antonym)

Giving strength, energy and vitality.

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lively (antonym)

Full of energy or alertness; vigorous or animated:

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Containing life; living.

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Emaciated; gaunt:

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Resembling death.

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Extremely bad.

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Seemingly invisible; as a ghost, similar to a ghost.

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Having the appearance of a spectre; ghostly.

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live (related)

Of a performance or speech, in person.

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help (related)

Extremely destructive or harmful

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terrifying (related)

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feared (related)

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(used as intensives) extremely

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(used as intensives) extremely

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(used as intensives) extremely

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lifelessly

as if dead

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ferocious (related)

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fearsome (related)

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killer (related)

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merciless (related)

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poison (related)

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That literally deprives of life; lethal, deadly, fatal.

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The definition of boring is something for making holes.

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energizing (antonym)

causing end of life

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(used as intensives) extremely

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vicious (related)

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Predictable, or always happening.

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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 81 synonyms, antonyms, idiomatic expressions, and related words for deadly, like: fatal, lethal, malignant, murderous, toxic, homicidal, venomous, bloody, deathly, noxious and mortal.