Adverbial dumbly has 2 senses
  1. dumbly, densely, obtusely - in a stupid manner; "he had so rapaciously desired and so obtusely expected to find her alone"
    Derived from adjective dumb1
  2. dumbly - in an inarticulate manner; "I nodded dumbly and he slit the envelope"
    Derived from adjective
    dumb2
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