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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Antonyms & Near Antonyms
Examples Sentences
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Recent Examples of underground
David Faris, Newsweek, 4 Nov. 2024
It is feared that inside some of the vehicles that were washed away or trapped in underground garages there could be bodies waiting to be recovered.
—Hernán Muñoz and Joseph Wilson, Los Angeles Times, 5 Nov. 2024
Brian Tallerico, Vulture, 16 Oct. 2024
The instruments lie more than a kilometer underground to avoid interference from cosmic rays and other sources of energy.
—Saima S. Iqbal, Scientific American, 4 Sep. 2024
Amanda Wray, Baltimore Sun, 7 Nov. 2024
The organized collectivist ants making their way underground were the threat hiding among unsuspecting Americans.
—Salama Udaipurwala, JSTOR Daily, 30 Oct. 2024
See all Example Sentences for underground 
Adjective
Julie Range, a policy manager for Commission Shift, an oil and gas watchdog group, commended the commission's request and called for a more rigorous review process for injection wells that contribute to underground pressure and exacerbate well failures.
—David Faris, Newsweek, 4 Nov. 2024
It is feared that inside some of the vehicles that were washed away or trapped in underground garages there could be bodies waiting to be recovered.
—Hernán Muñoz and Joseph Wilson, Los Angeles Times, 5 Nov. 2024
Noun
In this case, toxic masculinity gets merged with the urban legend of an underground that steals kidneys and leaves people in bathtubs.
—Brian Tallerico, Vulture, 16 Oct. 2024
The instruments lie more than a kilometer underground to avoid interference from cosmic rays and other sources of energy.
—Saima S. Iqbal, Scientific American, 4 Sep. 2024
Adverb
Many of us have seen images of trees that have roots depicted as being just as large underground as the canopy of branches reaching overhead.
—Amanda Wray, Baltimore Sun, 7 Nov. 2024
The organized collectivist ants making their way underground were the threat hiding among unsuspecting Americans.
—Salama Udaipurwala, JSTOR Daily, 30 Oct. 2024
See all Example Sentences for underground
Recent Examples of Synonyms for underground
Adjective
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Congress in recent years has been hot on the UAP trail, as a bipartisan but still somewhat fringe-y coalition of lawmakers has held hearings and applied pressure on other government entities to release information, particularly about any clandestine programs using taxpayer money.Tribune News Service, The Mercury News, 14 Nov. 2024
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The premise hinges on the idea that China is Mexico’s number-one oil buyer — formidable leverage for the mysterious Chinese agent’s clandestine plot.Andy Andersen, Vulture, 28 Oct. 2024
Adjective
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Farrow & Ball’s Cooking Apple Green on the walls complements the floors, which are painted in the company’s warm Picture Gallery Red—a popular hue for subterranean floors of the home’s era.David Foxley, Architectural Digest, 20 Nov. 2024
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The cave is home to a subterranean lake that is perfectly lit throughout the day thanks to a hole in the cave's ceiling.Stacey Leasca, Travel + Leisure, 5 Nov. 2024
Noun
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The proposal will likely encounter fierce resistance from big pharma and Robert F. Kennedy Jr., Trump’s nominee to lead the Department of Health and Human Services.Muri Assunção, New York Daily News, 26 Nov. 2024
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The extended air raid alarm in Kyiv lasted over seven hours, underscoring the toll on civilians as Russia continues its efforts to erode Ukrainian resistance.Dan Perry, Newsweek, 26 Nov. 2024
Adjective
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Federal law enforcement say Philippi told an undercover agent about his previous affiliations with extremist groups, including the Atomwaffen Division and National Alliance.Rachel Smith, The Courier-Journal, 6 Nov. 2024
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Lambesis infamously spent nearly three years in prison after pleading guilty to soliciting an undercover cop to murder his then-wife and relaunched the band in 2018 after his release from prison.Emily Zemler, Rolling Stone, 5 Nov. 2024
Adjective
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The heavyweight cast adds a sense of urgency to every covert invasion and reinforces the idea (shared by Sheridan’s Sicario) that some jobs need armies, not rogues.Noel Murray, Vulture, 18 Nov. 2024
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Militias also teamed up with election deniers to conduct covert surveillance of ballot drop boxes during the midterm elections, recent leaks published by Distributed Denial of Secrets and reported by WIRED show.Tess Owen, WIRED, 29 Oct. 2024
Adjective
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To photograph the intimate, in the private sphere, but also the presence of these couples in the public space (during lesbian demonstrations for example).Vogue, Vogue, 20 Nov. 2024
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The comedian posted a video on Instagram showing herself dancing alongside the two while in a private box at the concert.Kimberlee Speakman, People.com, 20 Nov. 2024
Thesaurus Entries Near underground
Cite this Entry
“Underground.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/underground. Accessed 3 Dec. 2024.
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