stealthy

(s) marked by quiet and caution and secrecy; taking pains to avoid being observed
- a furtive manner
- a sneak attack
- stealthy footsteps
- a surreptitious glance at his watch
furtive, sneak, surreptitious, sneaky,

Synonyms

furtive sneak surreptitious sneaky

Words of close approximity

stealth