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
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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
Examples Sentences
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Recent Examples of undercover
Peter Debruge, Variety, 11 Dec. 2024
In Season 1, Jun-ho infiltrates the games undercover in order to investigate what happened to his brother.
—Tracy Brown, Los Angeles Times, 24 Dec. 2024
Noah Goldberg, Los Angeles Times, 24 Apr. 2023
The hook for his inexcusably overlong gangster picture sends an informant undercover into the ranks of his brother’s crew of soccer hooligans to snitch him free of drug-dealing charges.
—Charles Bramesco, Vulture, 22 Apr. 2022
See all Example Sentences for undercover 
Adjective
Facing the ethical dilemma of working in a system defined by propaganda and violence, a brave teacher goes undercover to film what’s really happening in his own school.
—Peter Debruge, Variety, 11 Dec. 2024
In Season 1, Jun-ho infiltrates the games undercover in order to investigate what happened to his brother.
—Tracy Brown, Los Angeles Times, 24 Dec. 2024
Noun
Ideally, sufficient background has been done on the suspect and there is a surveillance plan in place so that other deputies besides the undercovers are monitoring the location where the sting occurs.
—Noah Goldberg, Los Angeles Times, 24 Apr. 2023
The hook for his inexcusably overlong gangster picture sends an informant undercover into the ranks of his brother’s crew of soccer hooligans to snitch him free of drug-dealing charges.
—Charles Bramesco, Vulture, 22 Apr. 2022
See all Example Sentences for undercover
Recent Examples of Synonyms for undercover
Adjective
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Samia shows up in London, allegedly to attend a conference, and Brandon rekindles their clandestine romance despite her suspicious security detail (A Real Pain‘s Kurt Egyiawan) sniffing about.David Fear, Rolling Stone, 30 Dec. 2024
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Be on the lookout for people engaging in clandestine connections.Lisa Stardust, People.com, 7 Dec. 2024
Adjective
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With some help from Past Lives star Teo Yoo, who plays newcomer Jang Kyun, Owen begins a covert operation for the Central Intelligence Agency, despite being a lawyer.Christy Piña, The Hollywood Reporter, 2 Jan. 2025
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This covert symbol was meant to communicate that the British were rowing across the Charles River, rather than marching on land.Sarah Kuta, Smithsonian Magazine, 2 Jan. 2025
Noun
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It's based on a French series, Le Bureau, possibly one of the best TV series of all time, but with differences in tone: Le Bureau's headquarters was a crowded warren of conference rooms and offices, which kept you tightly focused on the spies' intricate moves.Tom Gliatto, People.com, 20 Dec. 2024
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Netflix has also dropped a very festive teaser for (the upcoming) season 2 of the spy series.Charley Ross, Glamour, 20 Dec. 2024
Adverb
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Foundations and underground cables made of concrete, plastic, and metal can usually be recycled but are often left underground when a project is discontinued.Ariel Cohen, Forbes, 23 Dec. 2024
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The study, published in Science Advances, examined microbes from up to 3 miles underground and 1,600 feet beneath the seafloor.Benedict Cosgrove, Newsweek, 19 Dec. 2024
Adjective
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The secret key can be unlocked only when the user authenticates to the physical key using a PIN, password, or most commonly a fingerprint or face scan.Dan Goodin, Ars Technica, 30 Dec. 2024
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Perhaps your secret ingredient is cream cheese, buttermilk, or eggs (which is Joanna Gaines’ go-to).Karla Walsh, Southern Living, 30 Dec. 2024
Noun
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Hezbollah operatives had become suspicious that the pagers might be sabotaged, according to several officials.Mark Mazzetti, New York Times, 29 Dec. 2024
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Israel's military identified four of the men as combat propagandists and said that intelligence, including a list of Islamic Jihad operatives found by soldiers in Gaza, had confirmed that all five were affiliated with the group.Democrat-Gazette staff from wire reports, arkansasonline.com, 27 Dec. 2024
Adjective
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What is the best way to stay private, secure and anonymous while browsing the web?Kurt Knutsson, CyberGuy Report, Fox News, 1 Jan. 2025
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Utilities, food and dining out are affordable, and healthcare is either free or inexpensive under Spain’s public or private systems.Laura Begley Bloom, Forbes, 1 Jan. 2025
Noun
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There are action sequences, including a harrowing escape of agents stationed in Ukraine, and Martian’s fight skills are eventually put to good use.David Fear, Rolling Stone, 30 Dec. 2024
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Chinese researchers quickly isolated and sequenced the causative agent, a novel coronavirus initially named 2019-nCoV.Dave Wessner, Forbes, 30 Dec. 2024
Thesaurus Entries Near undercover
Cite this Entry
“Undercover.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/undercover. Accessed 10 Jan. 2025.
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