Related Clues:

• Waiter's intro
• Touched, in a way
• Word before luck or cluck
• Kind of luck
• Half-baked
• Sharp's opposite
• Hardly Ph.D. material
• Make absurdly easy, with "down"
• Not bright at all
• Mute
• Unable to speak
• Mum's gong for developing muscles
• Silent movie's first in name
• Stupid (slang)
• Incapable of speech