Source : Webster's Revised Unabridged Dictionary (1913)

Amusing \A*mus"ing\, a.
   Giving amusement; diverting; as, an amusing story. --
   {A*mus"ing*ly}, adv.

Source : WordNet®

amusingly
     adv : in an entertaining and amusing manner; "Hollywood has grown
           too sophisticated to turn out anything really amusingly
           bad these days" [syn: {divertingly}]