noun |
adj |
verb |
adv |
(adj) ulterior, subterraneous
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
(adj) subterraneous
being or operating under the surface of the earth
subterranean passages; a subsurface flow of water