Extremely destructive or harmful

• virulent

  1. Characterized by, causing, or promoting the rapid onset of severe illness. Used of a disease or toxin.
  2. Capable of causing disease by aggressively interfering with the immune system of the host. Used of a pathogen.
  3. Extremely hostile or malicious:

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  1. Characterized by, causing, or promoting the rapid onset of severe illness. Used of a disease or toxin.
  2. Capable of causing disease by aggressively interfering with the immune system of the host. Used of a pathogen.
  3. Extremely hostile or malicious:

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• pestilential

  1. Pestilent.

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  1. Pestilent.

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• pestilent

  1. Causing or likely to cause epidemic disease:
  2. Infectious or epidemic:
  3. Tending to cause death; deadly.

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  1. Causing or likely to cause epidemic disease:
  2. Infectious or epidemic:
  3. Tending to cause death; deadly.

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• pernicious

  1. Tending to cause death or serious injury; deadly:
  2. Causing great harm; destructive:

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  1. Tending to cause death or serious injury; deadly:
  2. Causing great harm; destructive:

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• malignant

  1. Tending to metastasize:
  2. Virulent or threatening to life:
  3. Having or showing ill will; malicious:

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  1. Tending to metastasize:
  2. Virulent or threatening to life:
  3. Having or showing ill will; malicious:

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• deadly

  1. Causing or tending to cause death:
  2. Suggestive of death:
  3. Aiming or wanting to kill; implacable:

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  1. Causing or tending to cause death:
  2. Suggestive of death:
  3. Aiming or wanting to kill; implacable:

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• baneful

  1. Causing harm, ruin, or death; harmful.
  2. Portending harm; ominous.

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  1. Causing harm, ruin, or death; harmful.
  2. Portending harm; ominous.

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Harmful

• deleterious

  1. Having a harmful effect; injurious:

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  1. Having a harmful effect; injurious:

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• pernicious

  1. Tending to cause death or serious injury; deadly:
  2. Causing great harm; destructive:

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  1. Tending to cause death or serious injury; deadly:
  2. Causing great harm; destructive:

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• baneful

  1. Causing harm, ruin, or death; harmful.
  2. Portending harm; ominous.

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  1. Causing harm, ruin, or death; harmful.
  2. Portending harm; ominous.

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Foul

• putrid

  1. Decomposed and foul-smelling; rotten:
  2. Proceeding from, relating to, or exhibiting putrefaction:
  3. Morally rotten; corrupt:

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  1. Decomposed and foul-smelling; rotten:
  2. Proceeding from, relating to, or exhibiting putrefaction:
  3. Morally rotten; corrupt:

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• foul

  1. Offensive to the senses; revolting:
  2. Having a bad odor or taste:
  3. Rotten or putrid:

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  1. Offensive to the senses; revolting:
  2. Having a bad odor or taste:
  3. Rotten or putrid:

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• noisome

  1. Offensive to the point of arousing disgust; foul:
  2. Harmful or dangerous:

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  1. Offensive to the point of arousing disgust; foul:
  2. Harmful or dangerous:

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Poisonous

• venomous

  1. Secreting and transmitting venom:
  2. Full of or containing venom:
  3. Malicious; spiteful:

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  1. Secreting and transmitting venom:
  2. Full of or containing venom:
  3. Malicious; spiteful:

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• virulent

  1. Characterized by, causing, or promoting the rapid onset of severe illness. Used of a disease or toxin.
  2. Capable of causing disease by aggressively interfering with the immune system of the host. Used of a pathogen.
  3. Extremely hostile or malicious:

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  1. Characterized by, causing, or promoting the rapid onset of severe illness. Used of a disease or toxin.
  2. Capable of causing disease by aggressively interfering with the immune system of the host. Used of a pathogen.
  3. Extremely hostile or malicious:

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• toxic

  1. Of, relating to, or caused by a toxin or other poison:
  2. Capable of causing injury or death, especially by chemical means; poisonous:
  3. Extremely risky or harmful, as a debt for which the borrower is in default and the collateral has lost so much value that its sale cannot cover the amount of the loan.

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  1. Of, relating to, or caused by a toxin or other poison:
  2. Capable of causing injury or death, especially by chemical means; poisonous:
  3. Extremely risky or harmful, as a debt for which the borrower is in default and the collateral has lost so much value that its sale cannot cover the amount of the loan.

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