Synonyms:
- back-door,
- backstairs,
- clandestine,
- covert,
- cowering,
- cringing,
- doggo,
- feline,
- furtive,
- hidden out,
- hidlings,
- hole-and-corner,
- hugger-mugger,
- in ambush,
- in hiding,
- in the wings,
- lurking,
- on tiptoe,
- privy,
- prowling,
- pussyfoot,
- pussyfooted,
- quailing,
- quiet,
- shifty,
- slinking,
- slinky,
- sly,
- sneaking,
- sneaky,
- stealing,
- stealthy,
- surreptitious,
- under cover,
- under-the-counter,
- under-the-table,
- undercover,
- underground,
- underhand,
- underhanded,
- unobtrusive,
- waiting concealed