What is another word for underground?

Need synonyms for underground? Here's a list of similar words from our thesaurus that you can use instead.

Situated beneath the surface of the ground
“The apartments will all have decked balconies with glass balustrades, ash veneer doors throughout and surface and underground car parking facilities.”
Relating to or denoting the secret activities of people working to subvert an established order
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“Today, imprisoned underground activists continue to write of this subjugated history from the cells that hold them.”
Favouring or introducing new and experimental ideas and methods
“Matthew has vivid memories of one of his first underground experiences.”
Seeking or intended to subvert an established system or institution
(of troops) Not belonging to regular or established army units
Lower in position
Minority or alternative
Beneath the surface of the ground
“The water then collects underground to emerge at various spots in the Maligne Canyon some 20 km away, another 425 metre descent.”
In or into secrecy or hiding, especially as a result of carrying out subversive political activities
“The state, like much of the nation as a whole, had a long history of underground industrial activity, especially in times of civil and military conflict.”
An underground railway, especially the one in London
“I then got the Underground and the train to Westcliff.”
A group or movement organized secretly to work against an existing regime
“Activists are aiming to build on the general feeling over the issue to get support across the underground for the dispute.”
Secret or subversive group
An illegal traffic or trade in officially controlled or scarce commodities
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