Related Clues:

• Not merely miff
• Hostile feeling
• Face reddener
• Push too hard, maybe
• Psychologist's concern
• Fester in one's mind
• Irk like crazy
• Continue to irritate
• Bother big-time
• Get to in a bad way
• Be a pest
• Keep poking, perhaps
• Second of the five stages of grief
• Make stew?
• Furious feeling