Related Clues:

• Loathing
• Bad blood
• Enmity
• Invoke misfortune
• Disrepute and then some
• Abhorrence
• Persistent bad luck
• Imprecation
• Use four-letter words
• Oath
• Intense dislike
• Contempt
• One that's ill-prepared?
• Turn the air blue
• 'May you live in interesting times,' e.g.