Open English Wordnet
Nouns
(n)sneaka person who is regarded as underhanded and furtive and contemptible Verbs
(v)sneak, mouse, creep, pussyfootto go stealthily or furtively“… stead of sneaking around spying on the neighbor's house” (v)sneakput, bring, or take in a secretive or furtive manner“sneak a look”,
“sneak a cigarette” (v)pilfer, cabbage, purloin, pinch, abstract, snarf, swipe, hook, sneak, filch, nobble, liftmake off with belongings of others (v)slip, sneakpass on stealthily“He slipped me the key when nobody was looking” Adjectives
(s)furtive, sneak, sneaky, stealthy, surreptitiousmarked by quiet and caution and secrecy; taking pains to avoid being observed“a furtive manner”,
“a sneak attack”,
“stealthy footsteps”,
“a surreptitious glance at his watch”