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virulent

American  
[vir-yuh-luhnt, vir-uh-] / ˈvɪr yə lənt, ˈvɪr ə- /

adjective

  1. actively poisonous; intensely noxious.

    a virulent insect bite.

    Synonyms:
    venomous
    Antonyms:
    harmless
  2. Medicine/Medical. highly infective; malignant or deadly.

  3. Bacteriology. causing clinical symptoms.

  4. violently or spitefully hostile.

  5. intensely bitter, spiteful, or malicious.

    a virulent attack.

    Synonyms:
    acerbic, vicious

virulent British  
/ ˈvɪrʊlənt /

adjective

    1. (of a microorganism) extremely infective

    2. (of a disease) having a rapid course and violent effect

  1. extremely poisonous, injurious, etc

  2. extremely bitter, hostile, etc

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Other Word Forms

Etymology

Origin of virulent

1350–1400; Middle English verulent < Latin vīrulentus, equivalent to vīr ( us ) poison ( see virus) + -ulentus -ulent

Explanation

A virulent disease is one that's infectious, spreading, and making lots of people sick, while a virulent rant is just a verbal attack, causing sickness of the emotional kind. Either way, something virulent puts a strain on the people who get it. Two meanings come out of the roots for virulent: "poisonous" and "spiteful." The virus-carrying meaning of virulent often gets combined with strain, such as in a "virulent strain of the flu." Those who aren’t carrying disease but are still considered virulent most likely lash out at others with a biting tone. Unleashing acid-tongued words on someone would be considered a virulent attack.

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Vocabulary lists containing virulent

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Virulent corruption compromised the security forces in other ways.

From Seattle Times • Dec. 9, 2019

Virulent opposition to vaccines is as old as vaccines themselves.

From The Guardian • Jul. 13, 2019

Virulent, it passes between people via sneezing, coughing, even talking, and is capable of lingering in the air or on a surface.

From Washington Times • May 8, 2019

Virulent strains, such as the current one, can cause victims to lose all moral perspective.

From Washington Post • Nov. 27, 2017

Virulent personal attack on me in your Review, signed with your name!

From Punch, or the London Charivari, Volume 100, April 11, 1891 by Various