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.

Adjective
Situated beneath the surface of the ground
“The apartments will have access to underground car parking facilities.”
Adjective
Relating to or denoting activities done in secret or with stealth
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“Today, imprisoned underground activists continue to write of this subjugated history from the cells that hold them.”
Adjective
Relating to or denoting activities done to subvert an established order
Adjective
Relating to or denoting a group or movement seeking to explore alternative forms of lifestyle or artistic expression
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“Matthew has vivid memories of one of his first underground experiences.”
Adjective
(of troops) Not belonging to regular or established army units
Adjective
Lower in position
Adjective
Concealed
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Adjective
From, or related to, a subgroup that does not form a numerical majority
Noun
An underground railway, especially the one in London
“We then got the underground to Paddington and finally got home after traveling for nearly fifteen hours.”
Noun
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.”
Noun
Secret or subversive group
Noun
An illegal traffic or trade in officially controlled or scarce commodities
Adverb
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.”
Adverb
Covertly or in secrecy or hiding
“Many times, this had to be done underground in secret as our culture was outlawed.”
Adverb
Into a state of being hidden
“He's apparently gone underground to avoid the authorities.”
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