'Dumbly' definitions:

Definition of 'dumbly'

From: WordNet
adverb
In a stupid manner; "he had so rapaciously desired and so obtusely expected to find her alone" [syn: dumbly, densely, obtusely]
adverb
In an inarticulate manner; "I nodded dumbly and he slit the envelope"

Definition of 'Dumbly'

From: GCIDE
  • Dumbly \Dumb"ly\, adv. In silence; mutely. [1913 Webster]