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
Synonyms & Similar Words
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
Synonyms & Similar Words
Antonyms & Near Antonyms
Example Sentences
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Recent Examples of underground
Rob Sheffield, Rolling Stone, 10 May 2025
Even the price tag of the new Mount Weather work is confidential, but contracting details suggest workers will must be skilled in both underground construction and HVAC equipment, including air handlers.
—Trevor Hughes, USA Today, 1 May 2025
Alphonse Pierre, Pitchfork, 21 Mar. 2025
The city this month began drilling at Del Prado Park, the first of several sites being explored to find safe, potable water underground.
—Kyle Martin, The Mercury News, 24 Jan. 2025
Dina Kraft, Christian Science Monitor, 7 May 2025
Efforts to crack down have failed, as lawmakers worry bans would simply push the trade underground or into delivery services, making regulation even harder.
—Tribune Content Agency, Mercury News, 6 May 2025
See All Example Sentences for underground
Adjective
The 18 tracks feature a murderers’ row of underground producers, including many he’s worked with in the past — Segal, the Alchemist, Messiah Musik, Preservation — as well as El-P, Sadhugold, Ant from Atmosphere, Steel Tipped Dove, and Conductor Williams.
—Rob Sheffield, Rolling Stone, 10 May 2025
Even the price tag of the new Mount Weather work is confidential, but contracting details suggest workers will must be skilled in both underground construction and HVAC equipment, including air handlers.
—Trevor Hughes, USA Today, 1 May 2025
Noun
This retro aesthetic now defines a reborn British underground, one that has been in a full-court press for the last few weeks.
—Alphonse Pierre, Pitchfork, 21 Mar. 2025
The city this month began drilling at Del Prado Park, the first of several sites being explored to find safe, potable water underground.
—Kyle Martin, The Mercury News, 24 Jan. 2025
Adverb
The government’s premise is that such a drastic move is necessary to finally oust Hamas from power and win the release of Israelis still held hostage deep underground in the Islamist militant group’s tunnels.
—Dina Kraft, Christian Science Monitor, 7 May 2025
Efforts to crack down have failed, as lawmakers worry bans would simply push the trade underground or into delivery services, making regulation even harder.
—Tribune Content Agency, Mercury News, 6 May 2025
See All Example Sentences for underground
Recent Examples of Synonyms for underground
Adjective
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The Gestapo, Hitler’s secret police, combed the Poles’ ranks in search of men with experience in clandestine resistance organizations.—
Paul Hockenos,
Smithsonian Magazine,
8 May 2025
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Alongside the harbour in Lerwick are five fishing boats, once part of the clandestine Anglo-Norwegian Shetland Bus mission, and the wartime cargo ship Hestmanden.—
Heather Farmbrough,
Forbes.com,
8 May 2025
Adjective
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This zone lasts up to three months per application and guides foraging subterranean termites to bait stations.—
Jason Phillips,
USA Today,
1 May 2025
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Raphael Martinez Cohen and Ryan Bush’s basement studio in Maspeth, Queens, feels a bit like a grotto, with shimmering panels propped up against subterranean walls.—
Hannah Martin,
Architectural Digest,
30 Apr. 2025
Noun
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The subtle but notable act of resistance comes just months after Trump cleaned house at the Kennedy Center, installing himself as chairman and close ally Richard Grenell as interim president.—
Anna Kaufman,
USA Today,
9 May 2025
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Signature details of the watch include a radiant purple mother-of-pearl dial, 300 meters of water resistance, and the Oris Red Rotor all-mechanical movement.—
Anthony DeMarco,
Forbes.com,
8 May 2025
Adjective
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The Han Solo bon mot is reminiscent of Diego Luna's confusion when he is asked about smoothing some of Cassian Andor's rougher edges to go undercover as fashion designer Varian Skye in the second block of Andor season 2 episodes.—
Maureen Lee Lenker,
EW.com,
1 May 2025
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Next up, he’s set to star alongside Bryce Dallas Howard and Sean Bean in the action comedy Deep Cover, about a group of improv actors who are asked to go undercover.—
Keith Langston,
People.com,
15 Apr. 2025
Adjective
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The covert intervention in Chile is perhaps the best example.—
Gal Beckerman,
The Atlantic,
1 May 2025
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An upper bedroom has a bookcase and covert panels leading to a secret room — a delight for imaginative young minds.—
Mike Klingaman,
Baltimore Sun,
30 Apr. 2025
Adjective
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And when the owner of the second-largest private company in the United States speaks, there’s an oracle-like aura that demands parsing.—
Philip Elliott,
Time,
2 May 2025
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The study describes how private businesses lack the financial incentive to fund basic and applied scientific research and development and how government agencies like the NIH and NSF ameliorate the market failure.—
ArsTechnica,
ArsTechnica,
1 May 2025
Cite this Entry
“Underground.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/underground. Accessed 15 May. 2025.
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