adj. |
[1] |
subterranean
,
buried
,
below-ground
,
sunken
,
covered
|
[2] |
secret
,
clandestine
,
concealed
,
hidden
,
covert
,
undercover
,
surreptitious
,
stealthy
,
private
|
[3] |
alternative
,
belowground
,
radical
,
experimental
,
avant-garde
,
nonconformist
,
revolutionary
|
[4] |
clandestine
,
cloak-and-dagger
,
hole-and-corner
,
hugger-mugger
,
hush-hush
,
secret
,
surreptitious
,
undercover
|
|