The act of being sneaky. Performing actions in a sneaky way.
He was sneakily sending text messages to his mistress as his wife watched the kids.
by PappaZappa April 03, 2009
It's just the adverbial form of sneak or sneaky. It's not a real word and it damned well should be!
I went into Dr. Aweful's mountain lab sneakily, and stole his blueprints for a flying monkey machine!
by Felix January 09, 2005