Adverb
In silence; mutely.
Source: Webster's dictionaryhe had so rapaciously desired and so obtusely expected to find her alone Source: Internet
I nodded dumbly and he slit the envelope Source: Internet
She’d just had a calf cut out of her side and now she stood there, dumbly chewing her cud, as if nothing had happened. Source: Internet
The person who wrote it has it written so that newbies can be can follow it line by line dumbly and end up with great results! Source: Internet