Related Clues:

• Mindless
• Brainless
• Foolish
• Dumb
• Ludicrous
• Asinine
• Stupid
• Really dumb
• Birdbrained
• Really stupid
• Half-baked
• Sounds as if there's more on this, I see, but little on ahead of one
• More on top? I see there's little enough on top
• Incredibly stupid
• Omicron (anag) - stupid