sneak

[1]	lurk , slink , steal , creep , skulk , cower , lurk , pad , prowl , sidle , (Colloq) pussyfoot
[2]	mouse , creep , pussyfoot
[3]	pilfer , cabbage , purloin , pinch , abstract , snarf , swipe , hook , filch , nobble , lift
[4]	slip

[1]	prowler , informer , (Colloq) tattle-tale , stalker , (Brit) grass , (Slang) stool-pigeon , snitch , (Brit/Australian) nark , (US) stoolie , (Mainly US/Canadian) fink , ratfink , (US) shoo-fly
[2]	fink , snitch , snitcher , stoolpigeon , stool pigeon , stoolie , sneaker , canary

adj.

[1]	furtive , sneaky , stealthy , surreptitious