Source : Webster's Revised Unabridged Dictionary (1913)

Exciting \Ex*cit"ing\, a.
   Calling or rousing into action; producing excitement; as,
   exciting events; an exciting story. -- {Ex*cit"ing*ly}, adv.

   {Exciting causes} (Med.), those which immediately produce
      disease, or those which excite the action of predisposing
      causes.

Source : WordNet®

excitingly
     adv : in an exciting manner; "at the time of its appearance, the
           movie must have seemed excitingly new, even
           revolutionary" [ant: {unexcitingly}]