Source : Webster's Revised Unabridged Dictionary (1913)

Idiotically \Id`i*ot"ic*al*ly\, adv.
   In a idiotic manner.

Source : WordNet®

idiotically
     adv : in an idiotic manner; "what arouses the indignation of the
           honest satirist is not the fact that people in
           positions of power or influence behave idiotically"