subterranean
| 1. |
(satellite adjective) lying beneath what is revealed or avowed, especially being deliberately concealed; "subterranean motives for murder"; "looked too closely for an ulterior purpose in all knowledge"- Bertrand Russell |
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Synonyms: ulterior |
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| 2. |
(satellite adjective) being or operating under the surface of the earth; "subterranean passages"; "a subsurface flow of water" |
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