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
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as in undercover
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Examples Sentences
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Recent Examples of underground
Shivani Vora, Architectural Digest, 10 Jan. 2025
Some glowing mushrooms are believed to attract insects to disperse spores, but bioluminescence occurring in parts of the fungi that are underground does not fit this hypothesis.
—Laura Baisas, Popular Science, 9 Jan. 2025
Drake Bentley, Journal Sentinel, 13 Dec. 2024
Crews arrived to find a partial collapse of the parking lot behind the stores and an active fire underground, according to the press release.
—Yaakov Katz, Newsweek, 28 Nov. 2024
Colin Mixson, New York Daily News, 3 Jan. 2025
None are buried underground or in a dangerous place.
—Taylor Wilson, USA TODAY, 3 Jan. 2025
See all Example Sentences for underground 
Adjective
Standout elements of this house include an open-air swimming pool, a screening room showing new and classic movies, a tequila bar, and an underground vinyl listening room.
—Shivani Vora, Architectural Digest, 10 Jan. 2025
Some glowing mushrooms are believed to attract insects to disperse spores, but bioluminescence occurring in parts of the fungi that are underground does not fit this hypothesis.
—Laura Baisas, Popular Science, 9 Jan. 2025
Noun
An Enbridge Energy pipeline in Jefferson County spilled nearly 70,000 gallons of crude oil underground, according to federal officials.
—Drake Bentley, Journal Sentinel, 13 Dec. 2024
Crews arrived to find a partial collapse of the parking lot behind the stores and an active fire underground, according to the press release.
—Yaakov Katz, Newsweek, 28 Nov. 2024
Adverb
Crimes underground overall fell more than 5% last year, but the number of murders doubled in the subway, with 10 killed in 2024 compared to five the year before.
—Colin Mixson, New York Daily News, 3 Jan. 2025
None are buried underground or in a dangerous place.
—Taylor Wilson, USA TODAY, 3 Jan. 2025
See all Example Sentences for underground
Recent Examples of Synonyms for underground
Adjective
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The rocket's upper stage, meanwhile, continued carrying its clandestine satellites to orbit.Mike Wall, Space.com, 10 Jan. 2025
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That looks set to continue with a new play from the veteran dramatist Howard Brenton set in 1942 and telling of a clandestine meeting at the Kremlin between Churchill and Stalin.Matt Wolf, New York Times, 3 Jan. 2025
Adjective
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The scene, in all its violence and absurdity, reveals the subterranean tensions between Diaspora Jews and Israelis.Gal Beckerman, The Atlantic, 13 Jan. 2025
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As the waterfall cascades through the mountain’s walls, vibrant lights illuminate the scene, creating a mesmerizing display that highlights the beauty of this subterranean treasure.Rafael Peña, Miami Herald, 10 Jan. 2025
Noun
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Russia, China and others are quite adept at this and now face less resistance.Axios, Axios, 8 Jan. 2025
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Both of those numbers suggest that today’s discount, with rates looking at a fair bit of upside resistance from here, is overdone.Brett Owens, Forbes, 8 Jan. 2025
Adjective
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During the prosecution’s case, jurors saw floods of emails, undercover videos and wiretapped phone calls in which McClain and ComEd executives discuss hiring Madigan associates, including precinct captains Edward Moody and Ray Nice, former 13th Ward Ald.Ray Long, Chicago Tribune, 8 Jan. 2025
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Reacher dives deep into an undercover ring by securing a job inside the operation though the stakes are high as he’s seen ducking from gunfire, explosions and no shortage of bad guys.Chris Gardner, The Hollywood Reporter, 8 Jan. 2025
Adjective
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Read: What Europe fears The Eagle S, however, apparently had a covert military purpose as well: Investigators discovered that the vessel was crammed full of advanced surveillance equipment, which used so much power that the ship suffered from periodic blackouts.Phillips Payson O’Brien, The Atlantic, 13 Jan. 2025
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Social Media Sites Are 'Vast Surveillance' Operations Even the Experts Have Trouble Getting Data Brokers to Stop Tracking Them According to Paxton, the covert data collection also violates the Texas Data Privacy and Security Act, which went into effect last July.Michael Kan, PCMAG, 13 Jan. 2025
Adjective
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One daddy gone, another come—Hoover makes a fable about the private and cyclical dangers of a certain kind of New England family.Doreen St. Félix, The New Yorker, 13 Jan. 2025
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Despite warnings from local officials and the FAA to keep private drones away from Southern California air spaces currently being used for fire suppression, Luna said the sheriff's office has dealt with at least two drone incidents since the wildfires broke out, resulting in three arrests.Sarah Lynch Baldwin, CBS News, 13 Jan. 2025
Thesaurus Entries Near underground
Cite this Entry
“Underground.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/underground. Accessed 18 Jan. 2025.
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