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underground

See definition of underground on Dictionary.com
  • adj.below the surface
  • adj.secret, subversive

synonyms for underground

  • buried
  • covered
  • subterranean
  • below ground
  • in the recesses
  • subterrestrial
  • sunken
  • underfoot
  • clandestine
  • hidden
  • experimental
  • private
  • revolutionary
  • covert
  • alternative
  • avant-garde
  • radical
  • concealed
  • hush-hush
  • resistant
  • surreptitious
  • unbowed
  • unconventional
  • under wraps
  • undercover
  • unusual
  • resistive
  • on the QT
  • on the sly
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antonyms for underground

MOST RELEVANT
  • authorized
  • condoned
  • ground
  • known
  • legal
  • public
  • sky
  • public
  • condoned
  • sky
  • ground
  • open
  • legal
  • known
  • authorized
  • conservative
Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.

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How to use underground in a sentence

Italy may owe some of its seismic activity to carbon dioxide bubbling up from deep underground.
CARBON DIOXIDE FROM EARTH’S MANTLE MAY TRIGGER SOME ITALIAN EARTHQUAKESMARIA TEMMINGAUGUST 26, 2020SCIENCE NEWS
So the group of refuseniks — one of many underground cells plotting freedom — decided to hijack a plane.
THE FAILED HIJACKING THAT REMADE THE SOVIET UNIONEROMO EGBEJULEAUGUST 24, 2020OZY
Archaeologists had known since 1916 that some holes lurked underground.
UNDERGROUND MEGA-MONUMENT FOUND NEAR STONEHENGEAVERY ELIZABETH HURTAUGUST 11, 2020SCIENCE NEWS FOR STUDENTS
Data from NASA’s Dawn orbiter, the study suggests, show signs that it may be harboring an ocean deep underground.
THE DWARF PLANET CERES MIGHT BE HOME TO AN UNDERGROUND OCEAN OF WATERNEEL PATELAUGUST 11, 2020MIT TECHNOLOGY REVIEW
For example, the team found that a seismometer placed 380 meters underground near Auckland, New Zealand, was not only registering human activity, but saw that activity halved during the lockdowns.
COVID-19 LOCKDOWNS DRAMATICALLY REDUCED SEISMIC NOISE FROM HUMANSCAROLYN GRAMLINGJULY 23, 2020SCIENCE NEWS
A giant underground motion sensor in Germany has taken its first measurements of Earth’s spin and tilt.
A GIANT UNDERGROUND MOTION SENSOR IN GERMANY TRACKS EARTH’S WOBBLESMARIA TEMMINGJULY 17, 2020SCIENCE NEWS
Like when you’re crawling through tight underground passages in a deep, dark cave.
THE CHALLENGE OF DINOSAUR HUNTING IN DEEP CAVESJOHN PICKRELLMAY 19, 2020SCIENCE NEWS FOR STUDENTS
All over the world the just claims of organized labor are intermingled with the underground conspiracy of social revolution.
THE UNSOLVED RIDDLE OF SOCIAL JUSTICESTEPHEN LEACOCK
One thing was certain: Grandfather Mole could travel much faster through the water than he could underground.
THE TALE OF GRANDFATHER MOLEARTHUR SCOTT BAILEY
And when he took an underground stroll he was almost sure to find a few angleworms, which furnished most of his meals.
THE TALE OF GRANDFATHER MOLEARTHUR SCOTT BAILEY
SYNONYM OF THE DAY
OCTOBER 26, 1985
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capacitor

WORDS RELATED TO UNDERGROUND

  • bootleg market
  • gray market
  • illegal sales
  • illegitimate business
  • illicit business
  • run
  • shady dealings
  • underground
  • underground market
  • underworld market
  • Trojan horse
  • collaborators
  • collaborators of enemy
  • saboteurs
  • subversives
  • underground
Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.