Synonyms of subterranean

subterranean

adjective

ˌsəb-tə-ˈrā-nē-ən 

as in underground

being, situated, or operating beneath the surface of the earth

a subterranean bunker that supposedly could withstand even an atomic blast

Synonyms & Similar Words

• underground
• subsurface
• belowground

Antonyms & Near Antonyms

• surface
• aboveground

Example Sentences

Recent Examples of subterranean

However, the price does account for an 875-square-foot subterranean addition installed in 2021, as well as a pool and cabin tacked onto the land in 2020. — Wendy Bowman, Robb Report, 9 Oct. 2026

The crystalline waters of the reservoir provide drinking water for more than 3 million people in 53 communities in eastern Massachusetts, fed by a subterranean, gravitational aqueduct. — Chris Tanaka, CBS News, 8 Oct. 2026

Conceived as an extension to a subterranean municipal facility, the structure houses exhibition halls, meeting rooms, and a planning bureau beneath petal-like volumes. — Kieron Marchese, Architectural Digest, 6 Oct. 2026

On a frigid but bright December morning, David Ellison, his top legal chief Makan Delrahim and coterie of executives took over a subterranean space in the New York City office of investment bank UBS. — Alex Weprin, HollywoodReporter, 6 Oct. 2026