lurking
1. [ adjective ] concealed and unsuspected
Examples:

"lurking dangers" "search for lurking ambiguities"

Related terms: concealed
2. [ adjective ] marked by quiet and caution and secrecy; taking pains to avoid being observed
Synonyms: furtive stealthy sneaky sneak surreptitious skulking
Examples:

"a furtive manner" "a lurking prowler" "a sneak attack" "stealthy footsteps" "a surreptitious glance at his watch" "someone skulking in the shadows"

Related terms: concealed
Similar spelling:   lurching
  Larkin