Related Clues:

• Dirty rotten scoundrel
• Move like a snake
• Unsavory one
• Move quietly
• Move with stealth
• Weirdo
• Move at a snail's pace
• Move like ivy
• Despicable sort
• Inch along
• Move close to the ground
• Move sneakily
• Peeping Tom, e.g.
• Stalker, e.g.
• Go at a snail's pace