surreptitious [sur-uhp-tish-uhs]
adjective
1. obtained, done, made, etc. by stealth, secrecy, or unauthorized activity.
2. acting in a stealthy way.
EX. I've noticed that little has changed in the world of enemy NPC AI in Skyrim. I can still manage to trick a barbarian into thinking he just imagined the arrows in his back by running to the back of his cave and being surreptitious until the eye-ball reticule returns to a slit and notifies me that I am hidden. Seriously, I've killed entire pirate dens and roving parties of Falmer this way. It just seems mean to pick on the incompetent like that.
