Today's Word o' the day is... surreptitious
Not as obscure as many, I've heard of it, I think I even know what it means, kind of, and may have actually used it once or twice. I would say it means something like.. um, secretive, sneaky? Sorta.
The dictionary says, done, made, or gotten by stealth; also, marked by stealth.
That's all. Except I'll leave you with this quote:
"-- John Ashcroft, "National Security; Prevention of Acts of Violence and Terrorism", Federal Register 66, no. 211, October 26, 2001"