undercover (adj.)
- abstruse
- armored
- backstairs
- blind
- buried
- cased
- clandestine
- cloaked
- close
- clouded
- coated
- concealed
- confidential
- coped
- covered
- covert
- cowled
- curtained
- encased
- enwrapped
- feline
- filmed
- floored
- furtive
- hidden
- hole-and-corner
- hugger-mugger
- hush-hush
- incommunicado
- latent
- mantled
- masked
- muffled
- mysterious
- obscure
- occult
- on
- packaged
- paved
- private
- privy
- quiet
- recondite
- secluded
- secret
- sequestered
- sheathed
- shelled
- shielded
- shifty
- sly
- sneaking
- sneaky
- stealthy
- surreptitious
- tented
- under-the-counter
- under-the-table
- underground
- underhand
- underhanded
- unknown
- unobtrusive
- veiled
- wrapped
