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subterraneous

DEFINITIONS OF: subterraneous

1

adj being or operating under the surface of the earth

Synonyms:
subterranean
subsurface
beneath the surface

adj 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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