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

See also: dumb

• aperient
• aperiodic
• aperitif
• apert
• aperture
• apery
• apeshit
• apetalous
• apetalous flower
• apex
• apex of the sun's way
• Apgar score
• aphaeresis
• aphaeretic
• aphagia
• aphakia
• aphakic
• aphanite
• aphanitic
• aphasia
• aphasic
• Aphasmidia
• aphelion
• apheresis
• apheretic