stealthy 
/ˈstɛlθi/ adjective
stealth·i·er; stealth·i·est /ˈstɛlθi/ adjective [also more stealthy; most stealthy] : quiet and secret in order to avoid being noticed
▪ the stealthy movements of the crocodile ▪ a stealthy burglar
▪ the stealthy movements of the crocodile ▪ a stealthy burglar
— stealth·i·ly /ˈstɛlθəli/ adverb
▪ She moved stealthily from room to room.
/ˈstɛlθəli/ adverb ▪ She moved stealthily from room to room.
