Related Clues:

• Nutty as a fruitcake
• Touched in the head
• Ditzy
• Offbeat
• A bit peculiar
• Eccentric, to put it nicely
• Ditsy
• Responding to medication, perhaps
• A bit eccentric
• Round the bend
• A bit bonkers
• Slightly nuts
• Slightly crazy
• Potty adult's potty? Extremely potty!
• A bit wacko