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
Related Words
Dissimilar Words
Example Sentences
Examples are automatically compiled from online sources to
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Recent Examples of undercover
Tess Kenny, Chicago Tribune, 11 June 2026
The sequel, which saw the Hill and Tatum repeat their undercover schtick in college, topped that total with a $331 million box office haul.
—Matt Donnelly, Variety, 10 June 2026
Martin Suarez, Rolling Stone, 13 Sep. 2025
Masks were once largely forbidden on the federal level unless an agent was working undercover, said Michael Bouchard, a former assistant director at the Bureau of Alcohol, Tobacco Firearms and Explosives who retired in 2007.
—Byron Tau, Chicago Tribune, 30 Aug. 2025
See All Example Sentences for undercover
Adjective
Two people, later identified as Fagan and Edwards, exited the Dodge and approached the undercover car, while the ATF officers also got out, the complaint states.
—Tess Kenny, Chicago Tribune, 11 June 2026
The sequel, which saw the Hill and Tatum repeat their undercover schtick in college, topped that total with a $331 million box office haul.
—Matt Donnelly, Variety, 10 June 2026
Noun
Four other agents accompanied me, all also operating undercover.
—Martin Suarez, Rolling Stone, 13 Sep. 2025
Masks were once largely forbidden on the federal level unless an agent was working undercover, said Michael Bouchard, a former assistant director at the Bureau of Alcohol, Tobacco Firearms and Explosives who retired in 2007.
—Byron Tau, Chicago Tribune, 30 Aug. 2025
See All Example Sentences for undercover
Recent Examples of Synonyms for undercover
Adjective
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Some may be announced publicly; others may happen in more clandestine ways.—
Eben Novy-Williams,
Sportico.com,
10 June 2026
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But clandestine flows aren’t the biggest factor behind the market calm.—
Matt Egan,
CNN Money,
9 June 2026
Adjective
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The film follows cybersecurity expert Daniel Kellner (Josh O’Connor), who lifts secret files about the existence of aliens from Wardex, a covert non-government organization that used to employ him.—
Tim Lammers,
Forbes.com,
13 June 2026
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The investigation also linked the activity to China based on IP addresses associated with a LinkedIn account and a Gmail account tied to the covert recruitment scheme.—
Michael Kan,
PC Magazine,
10 June 2026
Noun
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Big tech and corporate spies Grady’s stewardship of state money has been questioned in the past.—
Shirsho Dasgupta,
Miami Herald,
18 June 2026
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To get into 1970s Moscow spy mode as Twila, Richardson joined forces on a thrifting expedition with costume designer Anastasia Magoutas.—
Natalie Oganesyan,
Deadline,
17 June 2026
Adverb
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Nearly all Republican River water comes from underground.—
Allen Best,
Denver Post,
14 June 2026
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FPVs and drone bombing have driven Russian forces underground into bunkers and forced them to cover roads and facilities with nets, wire cages and steel mesh.—
David Hambling,
Forbes.com,
12 June 2026
Adjective
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Get Ready: Katy Perry Has Released a Sneak Peek of Her New Song And the internet has receipts.—
Mehera Bonner,
Marie Claire,
15 Mar. 2017
Adjective
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As Ruth’s secret grandchild, Evan is the last of the Warren bloodline, assuming Rosemary’s (Dale Dickey) genealogy research was accurate, and his death would end the curse for good.—
Louis Peitzman,
Vulture,
17 June 2026
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For one Washington baker, the secret ingredient to his recent business success has been his three young kids.—
ABC News,
ABC News,
17 June 2026
Noun
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The 24-year-old warehouse operative recently shared the eyebrow disaster online, though the incident itself happened last year.—
Ashley Vega,
PEOPLE,
12 June 2026
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Universal also produced a Bourne series called Treadstone, which ran for a single season on the USA Network and starred Jeremy Irvine as the CIA operative John Randolph Bentley.—
Ryan Coleman,
Entertainment Weekly,
12 June 2026
Adverb
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As a group of dancers surrounded her on the B-stage, she was surreptitiously harnessed into a rig that carried her aloft, limp yet belting, into the heavens, or at least into what looked like a UFO hovering over the arena.—
Chris Willman,
Variety,
7 June 2026
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Gray-hat hackers, unlike white-hats, surreptitiously sneak into corporate systems to find security vulnerabilities.—
Winston Cho,
HollywoodReporter,
4 June 2026
Cite this Entry
“Undercover.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/undercover. Accessed 20 Jun. 2026.
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