Source : Webster's Revised Unabridged Dictionary (1913)

Ineffectually \In`ef*fec"tu*al*ly\, adv.
   Without effect; in vain.

         Hereford . . . had been besieged for about two months
         ineffectually by the Scots.              --Ludlow.

Source : WordNet®

ineffectually
     adv : in an ineffectual manner; "she tried ineffectually to light
           the primus, and Thomas came to help her" [ant: {effectually}]