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
Synonyms & Similar Words
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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
Paul Lipman, Forbes.com, 4 Apr. 2025
Despite the Southland’s dry turn, the Metropolitan Water District of Southern California reports a record amount of water banked in reservoirs and underground storage areas.
—Ryan Fonseca, Los Angeles Times, 4 Apr. 2025
Susan Bard, Health, 18 Mar. 2025
The property would include 36 parking spaces — 22 surface-level and 14 underground.
—Joe Marusak, Charlotte Observer, 17 Mar. 2025
Nancy Walecki, The Atlantic, 18 Mar. 2025
They must be concealed and mobile; or they must be put underground and defended with antimissile systems such as Patriot and Aegis Ashore that the United States has been transferring to Israel, Poland, and Ukraine.
—Stephen Peter Rosen, Foreign Affairs, 14 Mar. 2025
See All Example Sentences for underground
Adjective
For example, ultra-low frequency (ULF) and very-low frequency (VLF) radio—used in fields including submarine and underground communications—require antennas that can span tens to hundreds of meters in size.
—Paul Lipman, Forbes.com, 4 Apr. 2025
Despite the Southland’s dry turn, the Metropolitan Water District of Southern California reports a record amount of water banked in reservoirs and underground storage areas.
—Ryan Fonseca, Los Angeles Times, 4 Apr. 2025
Noun
Salt water from the ocean or underground is rich in minerals and may provide the body with magnesium.
—Susan Bard, Health, 18 Mar. 2025
The property would include 36 parking spaces — 22 surface-level and 14 underground.
—Joe Marusak, Charlotte Observer, 17 Mar. 2025
Adverb
And the Los Angeles Department of Water and Power recently pledged to put all of the Palisades’ power lines underground.
—Nancy Walecki, The Atlantic, 18 Mar. 2025
They must be concealed and mobile; or they must be put underground and defended with antimissile systems such as Patriot and Aegis Ashore that the United States has been transferring to Israel, Poland, and Ukraine.
—Stephen Peter Rosen, Foreign Affairs, 14 Mar. 2025
See All Example Sentences for underground
Recent Examples of Synonyms for underground
Adjective
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Taking over a century-old garden house hidden within Shanghai’s storied alleys, Samuel Gui Yang softly partitioned the space, seducing the audience yet making every one of them a clandestine voyeur.—
Tianwei Zhang,
Footwear News,
1 Apr. 2025
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In a display of gallows humor at the sloppiness of the leaders’ theoretically clandestine communication, people online quickly turned those symbols into memes, and renamed their own chats Houthi PC small group.—
Kyle Chayka,
The New Yorker,
26 Mar. 2025
Adjective
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There’s even a hair salon, a spa, and even a gym, not to mention a subterranean garage that fits up to 16 cars.—
Abby Montanez,
Robb Report,
26 Mar. 2025
-
The project includes a subterranean parking structure; there would be one space per unit and another 41 spaces for the public and the church.—
Erika I. Ritchie,
Oc Register,
24 Mar. 2025
Noun
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The speaker has shown more resistance than his predecessors against DeSantis, who is reaching the end of his term and is barred from running for his seat a third time under state law.—
Alexandra Glorioso,
Miami Herald,
2 Apr. 2025
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But a longer-term offensive in Gaza could also draw stiff resistance from the Israeli public, a majority of which has been clamoring for a hostage release deal instead of a return to war.—
Eugenia Yosef,
CNN Money,
2 Apr. 2025
Adjective
-
In a hearing Tuesday, Mr. Ratcliffe said the officer was not undercover.—
New York Times,
New York Times,
26 Mar. 2025
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Attorneys for the Department of Justice are contesting Taal’s alleged timeline of the facts, after his lawyers said undercover immigration officers showed up at his residence last week in retaliation for filing the lawsuit.—
Gloria Pazmino,
CNN,
25 Mar. 2025
Adjective
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Then Gungnir covert sniper rifle seems like a bargain, relatively speaking, at just $12,867.—
Davey Winder,
Forbes.com,
28 Mar. 2025
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In the letter, Grassley wrote that the records would help shine a light on the Nazi planning of the covert escape routes.—
Michael Dorgan,
FOXNews.com,
27 Mar. 2025
Adjective
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With respect to a private creditor pursuing relief in state court, the answer is yes.—
Paul Du Quenoy,
MSNBC Newsweek,
27 Mar. 2025
-
To help administer the fund, in 1997 the FCC created the Universal Service Administrative Company, a private not-for-profit corporation that helps determine the amount larger carriers must contribute to it and disburses money to program beneficiaries.—
Melissa Quinn,
CBS News,
26 Mar. 2025
Cite this Entry
“Underground.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/underground. Accessed 10 Apr. 2025.
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