subterraneous

Speech parts

1. subterraneous - Adjective

2. subterraneous - Adjective Satellite

Being or lying under the surface of the earth; situated within the earth, or under ground; as, subterranean springs; a subterraneous passage.

Source: Webster's dictionary

subterranean ulterior secret buried underground hidden tunnel submarine profound basement covert undercover subaqueous secretiveness undergrow

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known public above surface obvious overhead

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subterranean motives for murder Source: Internet

looked too closely for an ulterior purpose in all knowledge Source: Internet

subterranean passages Source: Internet

a subsurface flow of water Source: Internet