subterraneous

Other forms: subterraneously

Definitions of subterraneous
  1. adjective
    being or operating under the surface of the earth
    synonyms: subterranean
    subsurface
    beneath the surface
  2. adjective
    lying beyond what is openly revealed or avowed (especially being kept in the background or deliberately concealed)
    synonyms: subterranean, ulterior
    covert
    secret or hidden; not openly practiced or engaged in or shown or avowed
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