Related Clues:

• Touched in the head
• Ditzy
• Bubbleheaded
• A bit cuckoo
• Spaced out
• Like an airhead
• Birdbrained
• Potty
• Barmy
• Not well, mentally
• Like Phoebe on "Friends"
• Ditsy
• Round the bend
• Featherbrained
• Rattlebrained