[ adverb ] in a faithful manner
"it always came on, faithfully, like the radio"
Used in print(S. J. Perelman, The Rising Gorge. New York:...)
It is , I am reliably given to understand , the technical argot for those who engage in your particular branch of the boost ; i.e. , burglars who rob while the tenants are absent , in contrast to hot slough prowlers , those who work while the occupants are home .