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underground

see definition of underground
  • adjbelow the surface
  • adjsecret, subversive
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Synonyms for underground

adj below the surface
  • buried
  • covered
  • subterranean
  • below ground
  • in the recesses
  • subterrestrial
  • sunken
  • underfoot

Antonyms for underground

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

fifth column

noun. secret or subversive group
  • Trojan horse
  • collaborators
  • collaborators of enemy
  • infiltrators
  • saboteurs
  • subversives
  • underground
Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.
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