1
as in clandestine
undertaken or done so as to escape being observed or known by others
an undercover operation to infiltrate the terrorist organization
Synonyms & Similar Words
Relevance
Antonyms & Near Antonyms
as in spy
a person who tries secretly to obtain information for one country in the territory of another usually unfriendly country
within the city was a well-organized fifth column, and these undercovers would make themselves known as soon as the invading forces breached the city limits
Synonyms & Similar Words
as in underground
Synonyms & Similar Words
Antonyms & Near Antonyms
Example Sentences
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Recent Examples of undercover
Rosalio Ahumada, Sacramento Bee, 7 Feb. 2025
The Homeland Security investigation began in October 2023 and used an undercover agent and a confidential informant, according to the document.
—Joe Marusak, Charlotte Observer, 6 Feb. 2025
Jessica Radloff, Glamour, 8 Sep. 2023
The documentary is a first time collaboration between ABC News Studios and the Associated Press following a former Army sniper undercover inside the KKK.
—ABC News, 30 Apr. 2023
See all Example Sentences for undercover 
Adjective
During the investigation, undercover law enforcement officers made purchases of meth and guns at stash houses in Sacramento.
—Rosalio Ahumada, Sacramento Bee, 7 Feb. 2025
The Homeland Security investigation began in October 2023 and used an undercover agent and a confidential informant, according to the document.
—Joe Marusak, Charlotte Observer, 6 Feb. 2025
Noun
Back at the hospital Jack tells Brady that working undercover took a lot of courage.
—Jessica Radloff, Glamour, 8 Sep. 2023
The documentary is a first time collaboration between ABC News Studios and the Associated Press following a former Army sniper undercover inside the KKK.
—ABC News, 30 Apr. 2023
See all Example Sentences for undercover
Recent Examples of Synonyms for undercover
Adjective
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Brendan Marks and Matt Baker uncovered documents that illustrate North Carolina’s clandestine research into conference realignment.—
Chris Branch,
The Athletic,
12 Feb. 2025
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This defiant and entertaining work playfully uses headshots and avatars to visualize clandestine audio recordings documenting years of Kafkaesque impositions, threats, and vital dissident art.—
Samantha Bergeson,
IndieWire,
10 Feb. 2025
Adjective
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Universal revealed character details for each of the film's leads, which can be read below: Academy Award® nominee Johansson plays skilled covert operations expert Zora Bennett, contracted to lead a skilledteam on a top-secret mission to secure the genetic material.—
Thomas G. Moukawsher,
Newsweek,
5 Feb. 2025
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Johansson plays covert operations expert Zora Bennett, who leads the top-secret mission.—
Samantha Bergeson,
IndieWire,
5 Feb. 2025
Noun
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These include spy satellites, missile warning sentinels, and spacecraft for the Global Positioning System.—
Ars Technica,
Ars Technica,
11 Feb. 2025
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South Korea's spy agency estimated in January that about 300 North Korean soldiers deployed to Russia to fight against Ukrainian forces had been killed, and a further 2,700 injured.—
Justin Gest,
Newsweek,
11 Feb. 2025
Adverb
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Tour guide killed after elevator malfunctions underground in Colorado gold mine: Sheriff Once crews arrived on the scene, the teen's friends led rescuers to the victim.—
Megan Forrester,
ABC News,
14 Feb. 2025
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For the Outies to live their lives without a second thought to that other person slaving away underground?—
Ben Travers,
IndieWire,
14 Feb. 2025
Adjective
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The discovery of some secrets could cost the secret-keeper their wealth, their prestige.—
Mikal Gilmore,
Rolling Stone,
16 Feb. 2025
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Or are there secret talks happening that Trump cannot keep quiet?—
Nick Paton Walsh,
CNN,
15 Feb. 2025
Noun
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Capone was holed up in Florida at the time but is believed to have sent four assassins to take out Moran and his operatives.—
Sarah Holzmann,
Smithsonian Magazine,
14 Feb. 2025
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Law enforcement officials warned Trump last year that Tehran had placed operatives in the U.S. with access to surface-to-air missiles.—
Alex Isenstadt,
Axios,
9 Feb. 2025
Adjective
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The top official of the Social Security Administration quit over the weekend after Elon Musk's Department of Government Efficiency sought access to sensitive records containing the private information of Americans, according to a source familiar with the dispute.—
Joey Garrison,
USA TODAY,
19 Feb. 2025
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In recent years, UC San Diego has invested considerable resources into bridging the gap between academia and private industry.—
Natallie Rocha,
San Diego Union-Tribune,
18 Feb. 2025
Noun
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The relationship between the Cubs and the Japanese player came into focus during Major League Baseball’s Winter Meetings, where Wasserman agent Joel Wolfe told reporters that the club had broached the subject of Suzuki potentially waiving his no-trade clause.—
Patrick Mooney,
The Athletic,
15 Feb. 2025
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One is focused on the agent, while the other stares at the man being scanned.—
Vicky Hallett,
NPR,
15 Feb. 2025
Thesaurus Entries Near undercover
Cite this Entry
“Undercover.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/undercover. Accessed 21 Feb. 2025.
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