subterranean

adjective
UK: /ˌsʌbtəˈreɪniən/
US: /ˌsʌbtəˈreɪniən/

  1. Underground; existing or happening below the surface of the earth.

    1. The subterranean river flows silently.
    2. Explorers discovered a vast subterranean network of caves beneath the mountains.

  2. Hidden or secret; operating out of sight or in a concealed manner.

    1. They led a subterranean existence.
    2. The group conducted subterranean activities to avoid detection by the authorities.

Synonyms

undercover hidden concealed secret underground
subterranean noun

  1. A place or space located underground.

    1. The rat lived in subterranean.
    2. The old city had a subterranean used for storage and escape routes.

Frequently Asked Questions

The word "subterranean" in English means: Underground; existing or happening below the surface of the earth., Hidden or secret; operating out of sight or in a concealed manner..

The phonetic transcription of "subterranean" is /ˌsʌbtəˈreɪniən/ in British English and /ˌsʌbtəˈreɪniən/ in American English. Click the 🔊 button to hear both pronunciations.

Synonyms for "subterranean": undercover, hidden, concealed, secret, underground.

Example usage of "subterranean": "The subterranean river flows silently.". More examples on the page.