Related Clues:

• Needs another way?
• Boob
• Concentrated
• None too swift
• Hardly suited for Mensa
• Slow to understand
• Not the brightest bulb on the Christmas tree
• Sold-out show
• Weakling
• Thickly populated
• Bubbleheaded
• Thickly packed
• Gullible type
• Heavy, as fog
• Gullible sort