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
Examples are automatically compiled from online sources to
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Recent Examples of underground
Michael Schneider, Variety, 15 May 2026
The good news is my friend and music brand aficionado Jennifer Frommer hosts her underground rave, Disquoteque, on Wednesday nights.
—Jesse Kirshbaum, SPIN, 15 May 2026
Letters To The Editor, The Orlando Sentinel, 24 Apr. 2026
The beetles winter underground, with adults emerging in late spring.
—Mary Marlowe Leverette, Southern Living, 22 Apr. 2026
ArsTechnica, 13 May 2026
The digital collection disseminated underground in Cuba served as a substitute for broadband Internet.
—Bill Kopp, SPIN, 13 May 2026
See All Example Sentences for underground
Adjective
The Hidden Third shares the same name as the podcast about true crime and underground money, launched by van Zeller in October 2025.
—Michael Schneider, Variety, 15 May 2026
The good news is my friend and music brand aficionado Jennifer Frommer hosts her underground rave, Disquoteque, on Wednesday nights.
—Jesse Kirshbaum, SPIN, 15 May 2026
Noun
Household water largely comes from underground, the same aquifer that connects to the springs.
—Letters To The Editor, The Orlando Sentinel, 24 Apr. 2026
The beetles winter underground, with adults emerging in late spring.
—Mary Marlowe Leverette, Southern Living, 22 Apr. 2026
Adverb
Murdock and his vigilante allies have been forced underground, while Fisk imposes multiple harsh authoritarian measures on the city to cement his power.
—ArsTechnica, 13 May 2026
The digital collection disseminated underground in Cuba served as a substitute for broadband Internet.
—Bill Kopp, SPIN, 13 May 2026
See All Example Sentences for underground
Recent Examples of Synonyms for underground
Adjective
-
Dark, dim, and a little grungy, with its scuffed checkerboard floors, worn old couches, peeling walls, and chalkboard menus, La Factoria feels like a clandestine underground speakeasy.—
Condé Nast,
Condé Nast Traveler,
7 May 2026
-
Filling out the role of Ilya is Jay Armstrong Johnson; Jimin Moon plays Shane; Ryann Redmond plays a wine-mom narrator who lives for their clandestine love.—
Dan Stahl,
New Yorker,
1 May 2026
Adjective
-
The architecture of the subterranean pathways that funnel magma to the surface, the chemistry of the magma, the cadence of eruptions, and the assortment of eruption styles differ from place to place.—
Quanta Magazine,
Quanta Magazine,
8 May 2026
-
The utility has a subterranean network of some 4,600 miles of pipes under the city, including significant stretches of original cast and ductile iron — some dating back to the 1800s — which pose a risk of gas leaks that could lead to an explosion.—
Robert Channick,
Chicago Tribune,
6 May 2026
Noun
-
Experts say combining protein intake with regular resistance training can help preserve mobility and independence with age.—
Malissa Rodenburg,
Health,
15 May 2026
-
When Brazil’s military dictatorship cuts a major highway through Yanomami land in the mid ‘70s, her images become an act of resistance and a turning point in her life, Maria Farinha Filmes said Thursday.—
Rafa Sales Ross,
Variety,
15 May 2026
Adjective
-
Khatri approached the undercover officer who had just presented the store’s clerk with a fake $1,000 winning ticket, court records show.—
Jack Jankowski,
The Orlando Sentinel,
9 May 2026
-
This image provided by the Justice Department and contained in the affidavit in support of a criminal complaint shows Victor Manuel Rocha during a meeting with a FBI undercover employee.—
Sergio Candido,
CBS News,
8 May 2026
Adverb
-
Various additional actions like this are stealthily undertaken by the vendor.—
Lance Eliot,
Forbes.com,
17 May 2026
-
Fukada stealthily shades in these subtleties of feeling into the story with exacting skill, creating a drama that touches on social issues but never feels issues-driven.—
Leslie Felperin,
HollywoodReporter,
13 May 2026
Adjective
-
Amarteifio and Edebiri have an understated chemistry that makes the covert passion between these two women believable.—
Lovia Gyarkye,
HollywoodReporter,
16 May 2026
-
These UUVs are becoming increasingly capable of autonomous operations and performing adaptive search patterns enabling wide area covert operations.—
Prabhat Ranjan Mishra,
Interesting Engineering,
14 May 2026
Adverb
-
Haslach also admitted to surreptitiously taking a photo of a minor in a swimsuit by positioning his cellphone under a classroom desk.—
Nick Ferraro,
Twin Cities,
1 May 2026
-
Sometimes the batteries on the trackers would run low, and McGovern’s team would need to remove and recharge the devices, before surreptitiously replacing them.—
Ed Caesar,
New Yorker,
30 Apr. 2026
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 19 May. 2026.
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