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
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
-
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
-
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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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
-
Cassian is now a secret spy for the budding Rebel Alliance.—
Fidel Martinez,
Los Angeles Times,
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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Chia seed water can also be a secret weapon for preventing traveler's constipation and supporting regular bowel movements.1 Chia Seed Nutrition Chia seeds are a small yet nutrient-dense food.—
Sohaib Imtiaz,
Verywell Health,
16 Apr. 2025
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When Charlie reveals a secret passion project, and professional lines begin to blur, the two forge an unexpected bond that will teach them both how to live.—
Katcy Stephan,
Variety,
16 Apr. 2025
Noun
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Rather, Nick Badolato, a Brooklyn Conservative Party operative, collected signatures to run on the party’s line against Zhuang.—
Chris Sommerfeldt,
New York Daily News,
14 Apr. 2025
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In one case, operatives posing as art dealers interested in purchasing a work by a dissident artist secretly installed surveillance equipment in his workplace and a GPS tracker on his car.—
David Faris,
MSNBC Newsweek,
11 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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What is the best way to stay private, secure and anonymous while browsing the web?—
Kurt Knutsson, CyberGuy Report,
FOXNews.com,
19 Apr. 2025
Noun
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Those qualities should top your list of agent must-haves, along with clear communication and high client ratings.—
Berit Thorkelson,
Better Homes & Gardens,
16 Apr. 2025
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Sellers can now choose whether to offer buyer agent compensation through MLS platforms—a change that has already begun reshaping how homes are bought and sold across the country.—
Thomas G. Moukawsher,
MSNBC Newsweek,
16 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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