adj., -i·er, -i·est.
Furtive; surreptitious.
sneakily sneak'i·ly adv.
sneakiness sneak'i·ness n.
The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.
