Related Clues:

• Hung-up
• Bubbleheaded
• Thickly packed
• Heavy, as fog
• Nuts about, with "on"
• Rearranged needs?
• Solid
• In a tight spot
• Thick-headed
• Very thick
• Close-knit
• Unwilling to budge
• Jam-packed
• In a rut
• In a pickle