1
as in clandestine
undertaken or done so as to escape being observed or known by others
an underground operation to smuggle ancient artifacts out of the country
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Antonyms & Near Antonyms
2
as in subterranean
being, situated, or operating beneath the surface of the earth
an underground shopping mall that is part of the city's subway system
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Antonyms & Near Antonyms
as in resistance
a secret organization in a conquered country fighting against enemy forces
joined the underground while still a teenager
Synonyms & Similar Words
as in undercover
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Antonyms & Near Antonyms
Example Sentences
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Recent Examples of underground
Devin Dwyer, ABC News, 5 Mar. 2025
Josef and Rosemarie raised three of Elisabeth's children, who Josef pretended Elisabeth left on their doorstep, while Elisabeth was forced to raise three of her children in a locked underground compound without windows.
—Jessica Sager, People.com, 1 Mar. 2025
Nina Corcoran, Pitchfork, 6 Feb. 2025
The toolkit was first put up for sale on a Russian criminal underground forum for $2,500 in Oct. 2024.
—Davey Winder, Forbes, 10 Feb. 2025
Carolyn Stein, Chicago Tribune, 21 Feb. 2025
Even stripped of defenses, facilities buried deep underground will be hard to destroy.
—Bloomberg Opinion, Twin Cities, 8 Feb. 2025
See All Example Sentences for underground
Adjective
Congress remains at an impasse over plans first approved more than 40 years ago to hold all of the country's nuclear waste at a single permanent, underground federal facility, which has never been completed.
—Devin Dwyer, ABC News, 5 Mar. 2025
Josef and Rosemarie raised three of Elisabeth's children, who Josef pretended Elisabeth left on their doorstep, while Elisabeth was forced to raise three of her children in a locked underground compound without windows.
—Jessica Sager, People.com, 1 Mar. 2025
Noun
Formed in 1966 in Canterbury, Kent, Soft Machine made a name for themselves on the London underground circuit playing a jazzy take on psychedelic prog-rock that eventually earned them slots opening for Pink Floyd and, in the U.S., Jimi Hendrix.
—Nina Corcoran, Pitchfork, 6 Feb. 2025
The toolkit was first put up for sale on a Russian criminal underground forum for $2,500 in Oct. 2024.
—Davey Winder, Forbes, 10 Feb. 2025
Adverb
At one point when working in the field, Groat and his team discovered an object buried underground.
—Carolyn Stein, Chicago Tribune, 21 Feb. 2025
Even stripped of defenses, facilities buried deep underground will be hard to destroy.
—Bloomberg Opinion, Twin Cities, 8 Feb. 2025
See All Example Sentences for underground
Recent Examples of Synonyms for underground
Adjective
-
The illicitly mined resources, which included valuable minerals and precious stones, were smuggled out of the country through clandestine networks, bypassing official regulatory controls for the benefit of consortium members at the expense of the state coffers.—
Antonio Maria Delgado,
Miami Herald,
11 Mar. 2025
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For those hoping to wed immediately, whether to avoid family scrutiny or cover up an out-of-wedlock pregnancy, clandestine marriages performed by Anglican clergy offered a welcome alternative.—
Alexandra Cox,
Smithsonian Magazine,
10 Mar. 2025
Adjective
-
Local residents dug them by hand out of the terrain’s red basaltic soil, resulting in an approximately 6,000-foot-long network of rooms and passageways that existed on three subterranean levels, ranging from 33 to 75 feet below ground.—
Laura Kiniry,
Smithsonian Magazine,
13 Mar. 2025
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For travelers venturing to the Uco Valley, there’s Casa de Uco, with its subterranean spa, and The Vines Resort & Spa, where some of the 21 modernist villas feature private outdoor spaces with soaking tubs.—
Michaela Trimble,
Vogue,
26 Feb. 2025
Noun
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The steam engine, the internet, mobile computing—all initially sparked uncertainty and resistance.—
Margie Warrell,
Forbes,
8 Mar. 2025
-
Compared to what has gone down recently in South Korea and Serbia, the level of resistance in legislative bodies is — in the words of Azealia Banks — Nathan.—
Bethy Squires,
Vulture,
7 Mar. 2025
Adjective
-
Watch Captain America: Civil War on Disney+ Black Widow After the events of Captain America: Civil War, Natasha is on the run and reunites with Yelena Belova (Florence Pugh), her undercover younger sister who also trained in the Red Room.—
Jacqueline Weiss,
People.com,
8 Mar. 2025
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The vast majority of undercover U.S. intelligence officers work out of embassies and consulates, posing as diplomats, and the closure of diplomatic posts would reduce the CIA's options for where to position its spies.—
arkansasonline.com,
arkansasonline.com,
7 Mar. 2025
Adjective
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Ralph Fiennes, Stanley Tucci, John Lithgow, Sergio Castellitto and Isabella Rossellini star in Conclave in which Cardinal Thomas Lawrence (Fiennes) is tasked with running this covert process after the unexpected death of the beloved Pope.—
Denise Petski,
Deadline,
2 Mar. 2025
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In covert gatherings across California, raw goat or cow milk is mixed with cane alcohol and sugars to make pajaretes.—
Ryan Fonseca,
Los Angeles Times,
26 Feb. 2025
Adjective
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Moreover, private innovative businesses cannot thrive or even survive for long without basic research at universities.—
Shivaram Rajgopal,
Forbes,
14 Mar. 2025
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The content creator has since made her Instagram private and appears to have deactivated her TikTok (samstrays_somewhere) account.—
Becca Longmire,
People.com,
14 Mar. 2025
Cite this Entry
“Underground.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/underground. Accessed 17 Mar. 2025.
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