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
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Antonyms & Near Antonyms
Example Sentences
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Recent Examples of underground
Jon Gambrell, Los Angeles Times, 15 Jan. 2025
On behalf of millions of riders, thank you Guv for making underground safety such a priority.
—New York Daily News Editorial Board, New York Daily News, 15 Jan. 2025
Kate O'Flaherty, Forbes, 11 Sep. 2024
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
Rachel Uranga, Los Angeles Times, 19 Jan. 2025
Since electrical transmission lines have been the cause of many of our recent fires, why doesn’t the state of California provide the funds to put the transmission lines underground and then charge the electrical utility companies 10% of their profits until the cost is fully repaid?
—U T Readers, San Diego Union-Tribune, 15 Jan. 2025
See all Example Sentences for underground 
Adjective
In April 2021, another blast tore apart one of its underground enrichment halls.
—Jon Gambrell, Los Angeles Times, 15 Jan. 2025
On behalf of millions of riders, thank you Guv for making underground safety such a priority.
—New York Daily News Editorial Board, New York Daily News, 15 Jan. 2025
Noun
Fraudsters can access your personal details — such as your name and email address — and sell them on the criminal underground known as the dark web.
—Kate O'Flaherty, Forbes, 11 Sep. 2024
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
Adverb
As homeowners turn to contractors for the slow process of rebuilding, an immigration policy that deports undocumented workers or forces them underground may hinder the recovery.
—Rachel Uranga, Los Angeles Times, 19 Jan. 2025
Since electrical transmission lines have been the cause of many of our recent fires, why doesn’t the state of California provide the funds to put the transmission lines underground and then charge the electrical utility companies 10% of their profits until the cost is fully repaid?
—U T Readers, San Diego Union-Tribune, 15 Jan. 2025
See all Example Sentences for underground
Recent Examples of Synonyms for underground
Adjective
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Given the clandestine nature of the process, the true number of fictitious sons who arrived during exclusion will never be known.—
Jane Hu,
The New Yorker,
23 Jan. 2025
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Inspired by the Belle Époque era in 1900 Buenos Aires, the soaring space manages to feel clandestine with its dim lighting, lush floral displays, and bartenders in crisp white jackets.—
Lauren Mowery,
Forbes,
22 Jan. 2025
Adjective
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The tunnels were discovered by experts from the Polytechnic University of Milan, who used ground-penetrating radar and laser scanners to map the 15th-century stronghold’s subterranean structures.—
Sonja Anderson,
Smithsonian Magazine,
24 Jan. 2025
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Photo : Carmel Realty Company The castle-like Turret House comes with a stainless spiral staircase leading down to a subterranean garage.—
Wendy Bowman,
Robb Report,
24 Jan. 2025
Noun
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The city was one of the epicenters of Syrian protests in 2011, protests that began peacefully but gave way to armed resistance after the government unleashed massive, lethal force on protest hubs across the country.—
Scott Peterson,
The Christian Science Monitor,
31 Jan. 2025
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This resistance is just one of many examples of the disconnect between leadership and faculty — a gap that could widen under Alston if transparency and collaboration are not prioritized.—
Andrea Apa,
Sun Sentinel,
31 Jan. 2025
Adjective
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One that, again, merged something familiar – an undercover cop – with something unfamiliar: the world of art fraud.—
Marta Balaga,
Variety,
24 Jan. 2025
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In 2023, Benjamin Coney, 30, and Emily Grace Brinley, 26, both from Conway, messaged an undercover FBI agent posing as a mom of two girls, according to a Jan. 16 news release by the U.S. Attorney’s Office for the Western District of Arkansas.—
Paloma Chavez,
Kansas City Star,
21 Jan. 2025
Adjective
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This isn’t a sly spy carrying out a covert operation; this is a spy whose careful plans have been overtaken by events.—
Ben Travers,
IndieWire,
24 Jan. 2025
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The Jacksonville Jaguars hired Tampa Bay Buccaneers offensive coordinator Liam Coen as the eighth head coach in franchise history Friday, capping a covert operation that included owner Shad Khan moving on from general manager Trent Baalke and Coen reversing course with the Bucs.—
Mark Long,
Chicago Tribune,
24 Jan. 2025
Adjective
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The billionaire declined to share details on his sources of financing, but said private equity firms and family offices have reached out to provide options.—
Krystal Hu,
USA TODAY,
25 Jan. 2025
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Court records show that in 2023, Rodrigues pleaded guilty to seven counts of stalking, stalking with a prior conviction and disclosing private images, but a judge suspended his prison sentence, instead ordering him to serve probation, the newspaper reported.—
Bailey Richards,
People.com,
25 Jan. 2025
Thesaurus Entries Near underground
Cite this Entry
“Underground.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/underground. Accessed 6 Feb. 2025.
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