backstairs (n.)
backstairs (adj.)
- clandestine
- covert
- feline
- furtive
- hole-and-corner
- hugger-mugger
- privy
- quiet
- shifty
- sly
- sneaking
- sneaky
- stealthy
- surreptitious
- under-the-counter
- under-the-table
- undercover
- underground
- underhand
- underhanded
- unobtrusive
