Source : Webster's Revised Unabridged Dictionary (1913)

Scoffingly \Scoff"ing*ly\, adv.
   In a scoffing manner. --Broome.

Source : WordNet®

scoffingly
     adv : in a disrespectful and mocking manner; "`Sorry,' she
           repeated derisively" [syn: {derisively}, {derisorily},
           {mockingly}]