sneaky
1. [ adjective ] marked by deception
Synonyms: underhanded underhand
Examples:

"achieved success in business only by underhand methods"

Related terms: crooked
2. [ adjective ] marked by quiet and caution and secrecy; taking pains to avoid being observed
Synonyms: furtive stealthy sneak skulking surreptitious lurking
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:   sneak
  snaky
  snack
  sneezy
  snazzy
  snag
  Snook
  snick
  snake
  sneeze