subterranean
/ˌsʌbtəˈreɪniən/
adjective
- Existing, happening, or done under the surface of the earth.
- Moles are subterranean animals that spend most of their lives underground.
- The city has an extensive subterranean network of tunnels and sewers.
- Subterranean rivers can carve out huge caves over thousands of years.
- Hidden or secret, especially in a way that is not obvious.
- His subterranean ambitions slowly came to light after years of quiet planning.
- There was a subterranean current of anger beneath the calm discussion.
- The organization operated through a subterranean network of informants.
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