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subterraneous

sub·ter·ra·neous

uncommon

adjective

1.

being or operating under the surface of the earth

  • “subterranean passages”
  • “a subsurface flow of water”
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2.

lying beyond what is openly revealed or avowed (especially being kept in the background or deliberately concealed)

  • “subterranean motives for murder”
  • “looked too closely for an ulterior purpose in all knowledge” Bertrand Russell
Synonyms
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Origin

Adapted borrowing of Latin subterrāneus + -ous. Doublet of subterrane.

WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.