Related Clues:

• Up to no good
• Diabolic
• Mean business?
• Nefariousness
• It's not good
• Perfidious
• It's not a good thing
• Stephen King topic
• Blackhearted
• Diabolical doings
• Mean business
• Good fighter?
• '___ falls on him who goes to seek it': Cervantes
• Hardly a good thing
• Good opponent