One who behaves in a stealthy, furtive way
To move silently and furtively
Someone acting as an informer or decoy for the police
To bring in or take out secretly
  1. smuggle
  2. spirit
Make off with belongings of others
Marked by quiet and caution and secrecy; taking pains to avoid being observed

Words Related to Sneak

Related words are words that are directly connected to each other through their meaning, even if they are not synonyms or antonyms. This connection may be general or specific, or the words may appear frequently together.