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
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Antonyms & Near Antonyms
Example Sentences
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Recent Examples of undercover
Liam Quinn, People.com, 11 Apr. 2025
An undercover police officer posing as a hitman conversed with Hellenthal, who allegedly explained how to access his former wife’s home and offered cash and jewelry as payment for killing her, the release stated.
—Aurora Beacon-News, Chicago Tribune, 11 Apr. 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
The reported indictment alleges that one of the people was an undercover agent.
—Liam Quinn, People.com, 11 Apr. 2025
An undercover police officer posing as a hitman conversed with Hellenthal, who allegedly explained how to access his former wife’s home and offered cash and jewelry as payment for killing her, the release stated.
—Aurora Beacon-News, Chicago Tribune, 11 Apr. 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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After authorities responded with mass arrests, weavers formed clandestine committees and took secret oaths.—
John Cassidy,
New Yorker,
14 Apr. 2025
-
Til Schweiger plays a sardonic whale-tourism boat captain (and former elite military operative, obviously) who gets roped into taking down a clandestine organization that’s building the perfect super-soldier through genetic experiments.—
Jordan Crucchiola,
Vulture,
4 Apr. 2025
Adjective
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After the unexpected death of the pope, Cardinal Lawrence (Ralph Fiennes) is tasked with running the covert process of choosing a new leader.—
Saman Shafiq,
USA Today,
22 Apr. 2025
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Those documents gave curious readers more details about Cold War-era covert U.S. operations in other nations, but did not initially lend credence to long-circulating conspiracy theories about who killed JFK.—
Josh Funk and Haya Panjwani,
Los Angeles Times,
18 Apr. 2025
Noun
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Cassian is now a secret spy for the budding Rebel Alliance.—
Fidel Martinez,
Los Angeles Times,
25 Apr. 2025
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The payloads included a South Korean military radar spy satellite, a small commercial weather satellite, and the most interesting payload: an experimental reentry vehicle from a German startup named Atmos Space Cargo.—
Abigail Bassett,
ArsTechnica,
25 Apr. 2025
Adverb
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The first reports of periodical cicadas emerging from their long wait underground came over the weekend from Fayette County, Tennessee and Buncombe County, North Carolina, according to the citizen science site Cicada Safari, which allows Americans to track the insect's path across the nation.—
Elizabeth Weise,
USA Today,
29 Apr. 2025
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Before a brood materializes on land, each of its members — sometimes trillions of them — exist underground as larvae, subsiding on fluids from plant roots, according to the National Wildlife Federation.—
Emily Mae Czachor,
CBS News,
28 Apr. 2025
Adjective
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For the privilege of associating with the Trumps, the startup would have to make, in effect, a secret multimillion dollar payment to World Liberty.—
Eric Lipton,
New York Times,
29 Apr. 2025
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Amazing tales of dead spacecraft that came back to life Related: SpaceX launches secret US spy satellite on 19th anniversary of company's 1st-ever liftoff (video, photos) The HALO Trust has been working in Cambodia since the 1990s, helping to scour hundreds of square miles of contaminated land.—
Tereza Pultarova,
Space.com,
29 Apr. 2025
Noun
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Still, Democratic operatives say the optics matter.—
Alexis Simendinger,
The Hill,
23 Apr. 2025
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These hybrid operatives babysit swarms of agents, write policy tests and negotiate with regulators.—
Zennon Kapron,
Forbes.com,
23 Apr. 2025
Adjective
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In 2022, a consortium of private retirement-plan providers announced a collaboration to boost the portability of small retirement accounts.—
Daniel de Visé,
USA Today,
20 Apr. 2025
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The firm’s team includes analysts from leading tech private equity firms, engineers, operating partners – former technology CEOs and COOs.—
Kenneth Squire,
CNBC,
19 Apr. 2025
Noun
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Gibbs meets his red-headed real estate agent, Diane (Kathleen Kenny).—
Bryan Alexander,
USA Today,
30 Apr. 2025
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The same source suggested to The Athletic that Sanders' refusal to hire an agent to represent him in an official capacity acted as a detriment.—
Chantz Martin,
FOXNews.com,
30 Apr. 2025
Cite this Entry
“Undercover.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/undercover. Accessed 2 May. 2025.
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