1. In a stupid manner
   - densely, obtusely 
2. In an inarticulate manner
   "I nodded dumbly and he slit the envelope"

See also: dumb

• Clusia rosea
• Clusiaceae
• cluster
• cluster bean
• cluster bomb
• cluster bomblet
• cluster headache
• cluster of differentiation 4
• cluster of differentiation 8
• clustered
• clustered bellflower
• clustered lady's slipper
• clustered poppy mallow
• clustering
• clutch
• clutch bag
• clutch pedal
• clutches
• clutter
• clutter up
• cluttered
• clv
• clx
• clxv
• clxx