Surreptitious [,sú-rup'ti-shus] 1. Marked by quiet and caution and secrecy; taking pains to avoid being observed. = furtive, sneak, sneaky, stealthy ~ concealed -- Who said you can't keep a secret for the rest of your life?. I didn't. It's of course guaranteed that not all people are gullible enough to let out a big secret. People like me. It's your choice if you wanna know. And I'm not one to stop you from doing what you decide to do. But curiosity did kill the cat. But what do I know, right?.