Related Clues:

• Tread stealthily
• Progress little by little
• Pussyfoot around?
• Proceed cautiously
• Slither slowly
• Move in typical rush-hour traffic
• Untrustworthy one
• Untrustworthy sort
• Pussyfoot
• Real stinker
• Move under cover
• Obnoxious one
• Walk on eggshells
• Eddie Haskell, e.g.
• Unpleasant fellow