bad actor

noun

plural bad actors
: a person, group, country, etc. who purposely and usually repeatedly engages in very bad behavior (such as committing crimes or causing harm to others)
Giving users a way to prove that they're being harassed with, say, a screenshot or some other form of authentication could help Twitter catch bad actors, even after they've covered their tracks.Issie Lapowsky
A perennial diplomatic bad actor, North Korea has already rattled its sabers at the opening of the Obama administration.Alex Kingsbury
"We've got to break away from the notion," as the U.A.W.'s [United Auto Workers] director of public relations, Peter G. Laarman, puts it, "that labor is a 'bad actor' in the economy. …"Harry Stein
also : something that causes trouble, danger, or a problem
The bad actor in male pattern hair loss is DHT, a metabolic product of testosterone. Jane E. Brody
We have special ducts throughout the vapor bath that carry away all the toxic bad actors. PC Today

Examples of bad actor in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Tech support bad actors, for example, often begin with a sudden call claiming that a virus has infected their computer. Jason Phillips, USA Today, 5 Sep. 2025 Without encryption, your internet traffic would be an open book for anyone to read, including bad actors. Anand Oswal, Forbes.com, 2 Sep. 2025 While older tactics like phishing emails and impersonating government agencies to steal credentials are becoming easier to spot, bad actors are now turning to more alarming methods. Kurt Knutsson, FOXNews.com, 1 Sep. 2025 In short, everything a bad actor needs to get away with identity theft on a large scale. Alan Henry, PC Magazine, 29 Aug. 2025 See All Example Sentences for bad actor

Word History

First Known Use

1879, in the meaning defined above

Time Traveler
The first known use of bad actor was in 1879

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Cite this Entry

“Bad actor.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/bad%20actor. Accessed 9 Sep. 2025.

Last Updated: - Updated example sentences
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