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
Relevance
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
Related Words
Dissimilar Words
Example Sentences
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Recent Examples of underground
Christian Zilko, IndieWire, 5 Sep. 2025
Moving the utilities underground also reduces the need for future power shutoffs.
—Michael Slaten, Oc Register, 29 Aug. 2025
Jason Ma, Fortune, 7 Sep. 2025
In its world, resurrected mammoths roam, AI governs underground facilities, and human-animal hybrids embody both triumph and ambiguity.
—Charlie Fink, Forbes.com, 6 Sep. 2025
Thomas Gounley, Denver Post, 14 Aug. 2025
The speaker system—designed in part by Shepherd and Tom Smith, co-founder of the famed underground Cosmic Slop party in Leeds—was meant to reference the disco setups at New York’s Paradise Garage and sub-heavy sound systems of Jamaica.
—Jeremy D. Larson, Pitchfork, 14 Aug. 2025
See All Example Sentences for underground
Adjective
Aaron Taylor-Johnson stars as Will Tranter, a major in the British Army specializing in explosives, who is called in after an old World War II bomb is discovered underground at a London construction site.
—Christian Zilko, IndieWire, 5 Sep. 2025
Moving the utilities underground also reduces the need for future power shutoffs.
—Michael Slaten, Oc Register, 29 Aug. 2025
Noun
The world’s largest underground, iron-ore mine has forced the village’s herders to lead their reindeer through a longer and harder migration route.
—Jason Ma, Fortune, 7 Sep. 2025
In its world, resurrected mammoths roam, AI governs underground facilities, and human-animal hybrids embody both triumph and ambiguity.
—Charlie Fink, Forbes.com, 6 Sep. 2025
Adverb
Some would be tucked behind the ground-floor commercial space, with the rest underground.
—Thomas Gounley, Denver Post, 14 Aug. 2025
The speaker system—designed in part by Shepherd and Tom Smith, co-founder of the famed underground Cosmic Slop party in Leeds—was meant to reference the disco setups at New York’s Paradise Garage and sub-heavy sound systems of Jamaica.
—Jeremy D. Larson, Pitchfork, 14 Aug. 2025
See All Example Sentences for underground
Recent Examples of Synonyms for underground
Adjective
-
The Bundy family’s statement noted this and said their destination was not clandestine, as the FBI document alleged.—
Nicole Blanchard,
Idaho Statesman,
7 Sep. 2025
-
The result was the Commandos, who operated in clandestine raids behind the lines to harass the enemy with remarkable success.—
New Atlas,
New Atlas,
7 Sep. 2025
Adjective
-
Afterward, retreat to the spa’s relaxation lounge—where a glowing copper teardrop floats above cedar banquettes—while next door, the subterranean fitness center boasts Technogym gear and treadmills—all below the waterline.—
Lewis Nunn,
Forbes.com,
6 Sep. 2025
-
But while the area has been evacuated, a gang of robbers led by James is drilling into the subterranean vault of a nearby bank.—
Carole Horst,
Variety,
5 Sep. 2025
Noun
-
Of course there's always resistance in neighborhoods.—
Kristen Edgreen Kaufman,
Forbes.com,
8 Sep. 2025
-
Stand with a resistance band in front of you and grab the ends.—
Jakob Roze,
Health,
8 Sep. 2025
Adjective
-
In it, Super Bowl-winning quarterback Eli Manning goes undercover in heavy prosthetics and a wig and dons the alias Chad Powers to try out as a walk-on quarterback for Penn State football.—
Lauren Huff,
Entertainment Weekly,
4 Sep. 2025
-
Senate Bill 627, for example, would prohibit law enforcement agents from covering their faces to obscure their identity, carving out exceptions for SWAT teams and undercover officers.—
Barnini Chakraborty,
The Washington Examiner,
3 Sep. 2025
Adverb
-
Karalis supplies his colleagues with fluorescent orange utility uniforms and stealthily leads them through the back door of the Bank Al Muraqabah, located just below Rahim’s building.—
Peter Debruge,
Variety,
6 Sep. 2025
-
Others are stealthily looking for deals, sales, using layaway options and trading brand preferences for affordability.—
Leah Olajide,
Freep.com,
26 Aug. 2025
Adjective
-
Woman of the Hour In her directorial debut, Anna Kendrick stars as aspiring actress Sheryl Bradshaw, who unknowingly crosses paths with a covert serial killer (Daniel Zovatto) while appearing on The Dating Game.—
Jacqueline Weiss,
PEOPLE,
7 Sep. 2025
-
That provision allows a president to take covert actions as long as Congress is informed.—
Emily Goodin,
Miami Herald,
5 Sep. 2025
Adverb
-
By the episode's end, however, he's set his sights on Morgan, having surreptitiously slipped a note into her grocery bag.—
Randall Colburn,
Entertainment Weekly,
6 Sep. 2025
-
Inevitably, a few students were surreptitiously checking smuggled screens that day.—
Christopher Bonanos,
Curbed,
5 Sep. 2025
Adjective
-
Get Ready: Katy Perry Has Released a Sneak Peek of Her New Song And the internet has receipts.—
Mehera Bonner,
Marie Claire,
15 Mar. 2017
Cite this Entry
“Underground.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/underground. Accessed 11 Sep. 2025.
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