"sneaking" in the verb sense
1. sneak, mouse, creep, pussyfoot
to go stealthily or furtively
"..stead of sneaking around spying on the neighbor's house"
put, bring, or take in a secretive or furtive manner
"sneak a look"
"sneak a cigarette"
3. pilfer, cabbage, purloin, pinch, abstract, snarf, swipe, hook, sneak, filch, nobble, lift
make off with belongings of others
4. slip, sneak
pass on stealthily
"He slipped me the key when nobody was looking"
"sneaking" in the adjective sense
1. sneaking, unavowed
not openly expressed
"a sneaking suspicion"
Source: WordNet® (An amazing lexical database of English)
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